Arizona Air Quality Designations 

Technical Support Document 

Boundary Recommendation 

for the 2008 Revision to the 

National Ambient Air Quality Standard for 

Lead 

Air Quality Division 

December 9, 2009
 1

This page is intentionally blank. 
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TABLE OF CONTENTS 

Page

EXECUTIVE SUMMARY......................................................................................................... ES-1 

1.0 BACKGROUND....................................... ......................................................................... 1 

2.0 AREA DESIGNATION CRITERIA............... ........................................................................... 2 

3.0 AREA DESIGNATION CRITERIA ANALYSIS FOR THOSE AREAS...................................... 3 

 RECOMMENDED AS ATTAINMENT/UNCLASSIFIABLE 

4.0 AREA DESIGNATION CRITERIA ANALYSIS FOR THOSE AREAS..............................5 

 RECOMMENDED AS NONATTAINMENT 

 

5.0 AREA DESIGNATION RECOMMENDATIONS ....................................................................... 24 

LIST OF FIGURES Page

ES-1 Topographical Features of Southern Gila County ........................................................ ES-2 

ES-2 Lead (Pb) Nonattainment Area Recommendation........................................................ ES-3 

1-1 Comparison of Pb National Ambient Air Quality Standards.............................................. 1 

3-1 Pb Monitors in Arizona............................................................................................... 4 

4-1 Hayden Pb Monitor Locations................. ...................................................................... 8 

4-2 Gila County Population Density 2005................... ............................................................. 9 

4-3 Gila County Population Density 2030.............. ............................................................ 10 

4-4 Pinal County Population Density 2005............................................................................. 11 

4-5 Pinal County Population Density 2030............................................................................. 12 

4-6 Gila County Employment Density 2005..........................................................14 

4-7 Gila County Employment Density 2030...........................................................15 

4-8 Pinal County Employment Density 2005.........................................................16 

4-9 Pinal County Employment Density 2030.........................................................17 

4-10 Proposed Nonattainment Area Annual Daily Average Traffic................................18 

4-11 Land Ownership Patterns in Gila County........................................................22 

5-1 Proposed Hayden Pb Nonattainment Area.......................................................25 

 
 ii

LIST OF TABLES Page

ES1 Criteria for Nonattainment Boundary Recommendations ............................................ ES-1 

1-1 Comparison of Pb National Ambient Air Quality Standards.............................................. 1 

3-1 Counties Recommended for Attainment/Unclassifiable..................................................... 3 

3-2 Selected Arizona Demographic Data................................................................................ 5 

4-1 Violations of the Pb NAAQS in the Hayden Area ......................................................... 7 

4-2 Historical and Projected Population for Hayden and Gila County ................................... 19 

4-3 Summary of Nine Criteria Analysis for the Proposed Hayden Pb ...........................23 

 Nonattainment Area 

APPENDICES Initial Reference Page

A. Ambient Monitoring Data................................................................................................... 3 

B. Procedures for Calculating Lead Design Values................................................................. 7 

C. CH2M Hill Technical Memorandum: Preliminary Evaluation of PM10 and Metals .................7 

 Concentrations from October 2007 to December 2008 in Ambient Air at the Hayden 

 and Winkelman Monitoring Stations 

D. Control Measures and Technologies Implemented at the ASARCO Ray Complex and............20 

 Hayden Smelter and Concentrator 

E. ADEQ Memo Certifying Hayden Area Air Quality Monitoring Data ............................................ 7 

F. ASARCO Contractor Zephyr Environmental Corporation Report on .......................................... 24 

 ADEQ’s Pb Boundary Recommendation 

G. ADEQ Response to ASARCO Consultant Zephyr Environmental Corporation Report ............... 24

H. Town of Kearny Resolution Regarding Pb Boundary Recommendation ...................................... 24
 1

Arizona Air Quality Designations 

Boundary Recommendations for the 2008 

Lead National Ambient Air Quality Standard 

EXECUTIVE SUMMARY 

In October 2008, the U.S. Environmental Protection Agency (EPA) revised the existing National Ambient 

Air Quality Standard (NAAQS) for Lead (Pb). EPA’s final rule for Pb, effective January 12, 2009, stated 

that the county in which violations of the Pb NAAQS had occurred would be the default boundary for Pb 

Nonattainment Areas within a state. Pb monitoring data has been collected by ADEQ at the JLG Supersite 

in Central Phoenix, by Freeport McMoRan in Miami, and contractors for EPA in Hayden. The one area in 

Arizona recommended as nonattainment consists of the Hayden portion of southern Gila and eastern Pinal 

Counties, the same boundaries as the existing Hayden Sulfur Dioxide (SO2) Nonattainment Area and the 

de facto impact area if the ASARCO Ray Complex copper concentrating and smelting operations. 

Arizona recommends the rest of the state be designated as attainment/unclassifiable for the 2008 Pb 

NAAQS. 

This recommendation follows careful consideration of the new Pb standard, requirements for designation 

of Nonattainment Areas, and options available for implementing the standard. This document 

demonstrates the impracticability of and lack of environmental benefit from designating the 

Nonattainment Area boundary based on EPA’s default area definition. Because the state is recommending 

nonattainment boundaries that are less than all of Gila and Pinal Counties, the state must address the 

following nine criteria listed in the table below. 

Table ES-1 

Criteria for Nonattainment Boundary Recommendations 

1. Emissions data (location of sources and contribution to Pb concentrations) 

2. Air quality data 

3. Population density and degree of urbanization (including commercial development) 

4. Traffic and commuting patterns 

5. Growth rates and patterns 

6. Meteorology (weather and air movement patterns) 

7. Geography/topography (mountain ranges or other air basin boundaries) 

8. Jurisdictional boundaries (e.g., counties, air districts, existing nonattainment areas, etc.) 

9. Level of control of emission sources. 

The region in which the proposed Nonattainment Area is located is defined by complex terrain; rugged 

mountain ranges and canyons define airflow patterns within the region. The Gila River Airshed, where 

Hayden is located, is bordered by mountain ranges to the north, east, and west. These geographic 

boundaries separate the Hayden area from the remainder of Gila County and help to contain emissions 

from ASARCO’s Ray Complex copper smelter and concentrator, which reside in the proposed 

Nonattainment Area. Figure ES-1 illustrates the complexity of the terrain that divides the Hayden area 

from most of Gila County. Weather patterns, the location of emission sources, a low potential for 

population growth, existing jurisdictional boundaries, and analyses of ambient monitoring data also 

support the exclusion of the majority of Gila and Pinal Counties from the Nonattainment Area. EPA 

agreed with the state’s position that Hayden and the majority of Gila and Pinal Counties are in separate 

ES-1 
 2

airsheds in its October 2006 final rule separating the Hayden and Miami PM10 Nonattainment Areas.1 

Analysis supporting the state’s nonattainment recommendations can be found in Section 4.0. The 

recommended Nonattainment Area also excludes Indian Country over which Arizona has no jurisdiction. 

Arizona’s alternative recommendation also includes designation as attainment/unclassifiable for the rest 

of the State, as explained in Section 3.0. Figure ES-2 illustrates the recommended Pb Nonattainment 

Area. 

Figure ES-1 

Topographical Features of Southern Gila and Pinal Counties

 

1

 On March 28, 2007, EPA approved ADEQ’s request to split the existing Hayden-Miami PM10 Nonattainment Area 

into two separate PM10 Nonattainment Areas (72 FR 14422). 

ES-2 
 3

Figure ES-2 

Pb Nonattainment Area Recommendation

ES-3 
 1

Arizona Air Quality Designations Boundary Recommendations for the 

2008 Pb National Ambient Air Quality Standard 

1.0 BACKGROUND 

The U.S. Environmental Protection Agency (EPA) is charged with developing air quality standards for 

the protection of human health and the environment. As required by the Clean Air Act (CAA), EPA sets 

primary and secondary National Ambient Air Quality Standards (NAAQS) for six common air pollutants, 

one of which is Pb.2

 Maximum pollution levels or limits that are based on human health are called 

primary standards. Limits intended to prevent environmental and property damage are called secondary 

standards. EPA is required to evaluate and revise the standards if scientific analyses indicate new 

standards would be more protective of public health and welfare. Prior to 2008, the Pb standard was last 

revised in 1978. 

The long-term health effects of Pb are severe; they include decreased growth, hyperactivity, impaired 

hearing, and even permanent brain damage. If detected early, these effects can be limited by reducing 

exposure to Pb and by receiving appropriate medical care. Children are particularly sensitive to the health 

effects of Pb. Prior to the conversion to an unleaded gasoline standard, vehicles were a significant source 

of Pb emissions. In Arizona, copper smelters and concentrators are currently one of the largest sources of 

ambient Pb emissions. 

In 2008, following extensive analysis, EPA adopted a revised standard to provide more protection for 

children and other ‘at risk’ populations from exposure to elevated levels of Pb pollution. EPA lowered 

the primary Pb standard from 1.5 micrograms per cubic meter (1.5 μg/m3

) to 0.15 ug/m3 (73 FR 66964; 

October 15, 2008). Concentrations are measured as Total Suspended Particles or TSP, a particle size 

range up to 45 micrometers in aerodynamic diameter. The secondary standard (for protection of the 

environment) was revised to a level identical to the primary standard. Table 1-1 compares the level of the 

1978 Pb standard to the new 2008 standard. 

Table 1-1 

 Comparison of Pb National Ambient Air Quality Standards 

Standard Level Averaging Time Form (Attainment Test) 

1978 Standard 1.5 μg/m3

 Calendar Quarter Maximum Arithmetic Mean 

2008 Standard 0.15 μg/m3

 3 months Rolling Three-Month 

Arithmetic Mean Concentration 

 

2

 See http://www.epa.gov/air/criteria.html for a complete list of National Ambient Air Quality Standards. 
 2

2.0 AREA DESIGNATION CRITERIA 

Under Clean Air Act (CAA) Section 107(d) the each state must make recommendations for areas that 

meet or do not meet new or revised NAAQS within one year following the promulgation of such 

standards. Each state’s recommendations for the 2008 Pb standard is due by October 15, 2009. EPA 

anticipates promulgation of final Pb designations by October 2011.3

 

Section 107(d)(1)(A)(i) of the Clean Air Act (CAA) defines a nonattainment area as ... any area that does 

not meet (or that contributes to ambient air quality in a nearby area that does not meet) the national 

primary or secondary ambient air quality standard for the pollutant. At present, EPA has not issued a 

guidance for areas found to be in nonattainment or deemed to be in attainment/unclassifiable for the Pb 

NAAQS. In the Pb final rule, however, EPA directed states to base nonattainment area boundary 

recommendations on a nine factor analysis similar to those established in EPA’s 1997 8-hour ozone 

NAAQS, the 1997 PM2.5 NAAQS, and the 2006 PM2.5 NAAQS. 

EPA recommends using county boundaries as the starting point or default boundary for evaluating the 

geographic boundaries of a Pb nonattainment area. To refine nonattainment boundaries for more 

appropriate recommendations (either larger or smaller boundaries than the default boundary) a state must 

perform an area-specific analysis that addresses the nine criteria discussed in the Executive Summary. 

In addition, the state should affirm that the nonattainment area analysis demonstrates that: "1) violations 

are not occurring in nearby portions that are excluded from the recommended area, and 2) the excluded 

nearby portions do not contain emission sources that contribute meaningfully to the observed violations." 

ADEQ considered these factors in developing the recommended attainment, unclassifiable, and 

nonattainment boundaries, as detailed in Section 3.0. 

 

3

 40 CFR Part 51 – National Ambient Air Quality Standard for Lead; Final Rule, 73 FR 66964, November 12, 2008. 
 3

3.0 AREAS RECOMMENDED AS ATTAINMENT/UNCLASSIFIABLE 

Areas recommended as attainment/unclassifiable include areas of the state where ambient Pb monitoring 

data are insufficient, where attainment of NAAQS has been demonstrated, and areas without significant 

point sources. For its analysis, ADEQ reviewed available ambient monitoring data and statistics for 

population density, degree of urbanization, traffic volume, commuting patterns, and jurisdictional 

boundaries. Table 3-1 discusses ADEQ’s determination for each criterion. 

ADEQ monitors ambient Pb concentrations in central Phoenix, but not throughout the state. Without 

sufficient monitoring data, the state cannot determine if an area is in nonattainment. The state plans to 

begin monitoring Pb concentrations in accordance with EPA’s Pb final rule. Those counties without 

sufficient monitoring data which are recommended as attainment/unclassifiable are listed at the bottom of 

this page. 

For its purposes, ADEQ reviewed ambient Pb monitoring data recorded by FMMI in Miami and data 

recorded by ADEQ in Phoenix. Monitoring data used to recommend the Hayden area of Gila and Pinal 

Counties as nonattainment is discussed in Section 4.0. For those portions of Gila County recommended as 

attainment/unclassifiable, ADEQ analyzed ambient Pb concentrations monitoring data for the Miami area 

collected by Freeport McMoRan Miami Inc. (FMMI) starting in January 2006 and ceasing in December 

2008. Due to incomplete records, the monitoring data for the Miami area is indeterminate. ADEQ is 

recommending the Miami area be designated as attainment/unclassifiable. 

Starting in January 2005, ADEQ has been monitoring Pb concentrations at the James L. Guyton (JLG) 

Supersite in central Phoenix. Monitoring data from this site has demonstrated that the state’s most 

populous city is in attainment of the Pb NAAQS. Based on these data, ADEQ is able to discern that urban 

commercial operations, high population density, automobile emissions, high traffic volume, and high 

growth rates have a minimal impact on ambient Pb concentrations in Arizona. Ambient monitoring data 

is included in Appendix A. 

 

Based on the analysis discussed above, ADEQ concludes the following full and partial counties are not 

experiencing or likely causing or contributing to an exceedance of the Pb NAAQS and, therefore, should 

be classified as attainment/unclassifiable. Sections of Gila and Pinal Counties recommended for 

nonattainment are discussed in Section 4.0. Figure 3-1 illustrates the location of Pb monitors in Arizona. 

Table 3-2 contains demographic data about each county in the state. 

Table 3-1 

Counties Recommended As Attainment/Unclassifiable 

Apache County Greenlee County Pima County 

Cochise County La Paz County Pinal County (Partial) 

Coconino County Maricopa County Santa Cruz County 

Gila County (Partial) Mohave County Yavapai County 

Graham County Navajo County Yuma County 
 4

Figure 3-1 

Pb Monitors in Arizona 
 5

Table 3-2 

Selected Arizona Demographic Data 

County/Largest City 2008 

Population 

2008 Density 

(persons per 

square mile) 

Area 

(square miles) 

Apache County 76,156 6.8 11,204.9 

 Eagar 4,810 

Cochise County 139,434 22.6 6,169.4 

 Sierra Vista 45,908 

Coconino County 135,613 7.3 18,617.4 

 Flagstaff 64,693 

Gila County 57,361 12.0 4,767.7 

 Payson 16,965 

Graham County 38,633 8.3 4,629.3 

 Safford 9,982 

Greenlee County 8,950 4.8 1,847.0 

 Clifton 2,616 

La Paz County 21,544 4.8 4,499.9 

 Quartzsite 3,692 

Maricopa County 3,987,942 433.3 9,203.1 

 Phoenix 1,561,485 

Mohave County 205,862 15.5 13,311.6 

 Lake Havasu City 55,429 

Navajo County 114,780 11.5 9,953.2 

 Show Low 12,315 

Pima County 1,014,023 110.4 9,186.3 

 Tucson 543,959 

Pinal County 350,558 65.3 5,369.6 

 Casa Grande 45,116 

Santa Cruz County 47,471 38.4 1,237.6 

 Nogales 21,709 

Yavapai County 227,348 28.0 8,123.3 

 Prescott 43.280 

Yuma County 203,779 37.0 5,514.1 

 Yuma 93,719 

Arizona Total 6,629,455 58.3 113,634.6 

 Source: U.S. Census Bureau, Census 2000. Arizona Department of Commerce, Population 

 Statistics Unit, December 12, 2008. 

4.0 AREAS RECOMMENDED AS NONATTAINMENT 

According to EPA's guidance, the default nonattainment area boundary for areas violating the air quality 

standard or contributing to a violation in a nearby area is the county in which the violating monitor is 

located. The Hayden area of Gila and Pinal Counties is the only location where ambient air monitors 

have recorded concentrations of Pb that violate the air quality standard. Most of the Gila County, 

however, contains vast expanses of undeveloped public lands and isolated rural communities that are not 

affected by Pb emissions originating from ASARCO’s Hayden copper concentrating and smelter 

operations. The townships in eastern Pinal County recommend as nonattainment are similarly isolated 
 6

from growing urban areas in the western and northern portions of the county by publicly owned lands and 

rugged terrain. 

This recommendation addresses the nine factors or criteria outlined in EPA's guidance to determine a 

more appropriate nonattainment area boundary. What follows is an explanation of how each criterion was 

addressed in Arizona’s determination. 

4.1 Air Quality Data 

For its determinations, ADEQ reviewed valid ambient Pb monitoring data recorded at three air quality 

monitors. One monitor is located in central Phoenix and two monitors are located in the Hayden area near 

the ASARCO Ray Complex copper concentrating and smelting operations. 

The JLG Supersite PM10 monitor located in central Phoenix is operated as part of the National Air Toxics 

Trends (NATTS) network representing the Phoenix metropolitan area. The JLG Supersite PM10 samplers 

are operated by ADEQ; the filters are processed by ERG laboratory as part of the NATTS program. 

ADEQ validates the laboratory results before submitting the data in AQS. The validation procedure 

verifies that the monitor passed all quality control tests. Monitor operation, sample handling and shipping, 

and data validation are included in the ADEQ NATTS/ATMP/PAMS4

 Quality Assurance Project Plan 

(QAPP). The JLG Supersite monitor has not recorded violations of the Pb NAAQS. 

The two PM10 monitors in Hayden and Winkelman are part of the Remedial Investigation (RI) being 

conducted by EPA Region IX Superfund; sampling at these monitors began in November 2006 and is 

scheduled to continue through 2011. Data sets from these monitors are entered in the EPA Air Quality 

System (AQS) database; Appendix A contains PM10 and Pb sample results collected during 2006-2008. 

These Partisol filter-based monitors are approved by EPA as a federal reference method for Pb. 

The Hayden monitoring station is located on the roof of the Town of Hayden maintenance building; the 

Winkelman monitor is located on the roof of the Hayden High School gymnasium in Winkelman. 24-

hour samples were collected every sixth day until March 28, 2008, at which point the frequency was 

increased to every third day through December 2008. Meteorological data were also collected at these 

sites, including average ambient temperature, relative humidity, and wind speed and direction. The 

locations of the Hayden and Winkelman monitors are depicted in Figure 4-1 on Page 8. 

The Hayden and Winkelman PM10 samplers have been operated by two contractors: CH2M Hill and 

Innovative Technical Solutions Incorporated (ITSI). CH2M Hill wrote the QAPP, Field Sampling Plan 

(FSP), and Data Management Plan in November 2005; CH2M Hill commenced air quality sampling in 

November of 2006 and continued monitoring until ITSI assumed responsibility in March 2009. The 

QAPP was amended when ITSI was assigned the project by EPA Region 9. ITSI also amended the Field 

Sampling Plan (FSP) written by CH2M Hill. 

The monitor filters were processed by a contract laboratory, Chester LabNet. CH2M Hill performed 

quality control checks on the monitors per the QAPP and FSP. ADEQ's review of the QAPP documents 

and quality control checks concluded the lead data provided by the EPA Region IX Superfund Program 

has experienced at least three levels of validation (sampler field checks and verification of sample validity 

immediately after collection; laboratory analysis and quality control checks of laboratory procedures; and 

review by EPA Superfund staff). These procedures are comparable to the procedures followed by ADEQ. 

 

4

 ATMP is an abbreviation for Air Toxics Monitoring Program; PAMS is an abbreviation for Photochemical Assessment 

Monitoring Station. 
 7

ADEQ used data substitution procedures because data completeness for the Hayden and Winkelman 

monitors was less than 75 percent for several months in the 2006-2008 period. For its substitutions, 

ADEQ used the lowest concentration recorded in a given month during the three-year period; for 

example, if a substitution was required in the month of January, ADEQ substituted the lowest 

concentration recorded among January 2006, January 2007, and January 2008. ADEQ's statistics are 

included in Appendix A. 

Figure 4-1 

Hayden Pb Monitor Locations 
 8

The Winkelman monitor has not recorded violations of the Pb NAAQS; the Hayden monitor, however, 

recorded three separate three-month averages in violation of the NAAQS, as shown below in Table 4-1. 

CH2M Hill prepared a preliminary report on the data collected from November 2007-November 2008 

(see Appendix C); the report identified the same three-month averages at the Hayden monitor as being 

above the Pb standard. This report did not include the full dataset provided by EPA Region IX to ADEQ 

(October 2006-December 2008, Appendix A). The CH2M Hill report noted that the findings may change 

once all of the data has been validated and all quality assurance and control procedures (QA/QC) have 

been completed. An ADEQ memo documenting that all QA/QC procedures for the monitoring data were 

completed in compliance with EPA guidelines is contained in Appendix D. 

Table 4-1 

Violations of the Pb NAAQS at the Hayden Monitor 

Ending Month of Three-Month Average Pb Concentrations in μg/m3

September 2008 0.17 

October 2008 0.19 

November 2008 0.21 

4.1.1 Design Values 

A design value is a statistic that describes the air quality status of a given area relative to the level of the 

NAAQS. Design values are typically used to classify nonattainment areas, assess progress towards 

meeting the NAAQS, and for development of control strategies. Design values are expressed as a 

concentration, thereby allowing a direct comparison to the level of the standard. They are based on 

multiple years of data, ensuring a stable indicator. The air quality design value for the 2008 Pb NAAQS is 

defined as the maximum rolling three-month average over a three-year period (i.e., 2006-2008). The level 

of the 2008 Pb NAAQS is 0.15 micrograms per cubic meter (μg/m3

) which is not to be exceeded in any 

three-month period. The design value of the Hayden monitor data is the November 2008 three-month 

average of 0.21 μg/m3

. 

4.2 Emissions Data (location of sources and contribution to Pb concentrations) 

Monitoring data indicates the ASARCO concentrator and smelter are the largest sources of Pb emissions 

in the area. Extensive chemical analyses of filters from both the Hayden Maintenance Yard and Hayden 

High School monitors were conducted as part of the EPA study of the Hayden Superfund site. The 

chemical fingerprint on the filters, combined with analysis of wind speeds and direction indicate that the 

operations at the ASARCO Ray Complex copper concentrating and smelting operations are the most 

likely source of the Pb exceedances measured at the Hayden Maintenance Yard monitor. This conclusion 

is based on high concentrations of sulfur, copper, arsenic, and iron, in addition to Pb, on the same date. As 

required by the operating permit issued by ADEQ, ASARCO reported compound Pb emissions totaling 

4.82 tons in 2008. This figure includes fugitives and stack emissions. 

4.3 Population Density and Degree of Urbanization 

For these criteria, population density, employment, and land ownership were examined for the proposed 

Nonattainment Area. These data provide an indicator of the levels of anthropogenic activity that can 

contribute to Pb emissions and the size of the exposed population. A review of the projections depicted in 

Figures 4-2 thru 4-6 demonstrates that population density in the proposed Nonattainment Area and the 

surrounding region is minimal and, according to approved Arizona population estimates, 5 is not projected 

to change significantly through the potential maintenance period (2011-2031.) 

 

5

 Source: Building a Quality Arizona, Arizona Department of Transportation, 2009. 
Figure 4-2 

Gila County Population Density 2005 

Source: Arizona Department of Transportation (Building A Quality Arizona) 
Figure 4-3 

Gila County Population Density 2030 

Ibid. 
Figure 4.4 

Pinal County Population Density 

Ibid. 
Figure 4-5 

Pinal County Population Density 2030 

Ibid. 
 13

4.4 Traffic and Commuting Patterns 

The volume of traffic in the Hayden area is low according to traffic counts conducted by ADOT. The 

proposed Nonattainment Area includes sections of Highways 177 and 77, arterials with the highest traffic 

counts in the area (3,036 trips per day). By comparison, traffic counts for Highway 84 in Casa Grande, the 

largest city in Pinal County, are nearly three times as high (10,562); traffic counts for U.S. 60 in Globe 

are nearly eight times higher (16,978 trips per day). Figure 4-11 illustrates the annual average daily traffic 

volume for the Hayden area according to ADOT. Figures 4-7 thru 4-10 illustrate the level of population 

density in 2005 and projections for 2030. Census Bureau data indicates commuting to and from Gila 

County for employment purposes is minimal. 
Figure 4-6 

Gila County Employment Density 2005 

Ibid. 
Figure 4-7 

Gila County Employment Density 2030 

Ibid. 
Figure 4-8 

Pinal County Employment Density 2005 

Ibid. 
Figure 4-9 

Pinal County Employment Density 2030

Ibid. 
 18

Figure 4-10 

Proposed Pb Nonattainment Area Annual Average Daily Traffic 

Source: Arizona Department of Transportation 
19

4.5 Growth Rates and Patterns 

Development in Gila and Pinal Counties is defined by patterns of land ownership. The U.S. Forest 

Service is the largest landholder in Gila County, accounting for 56 percent of the land area. Indian 

reservations cover 37 percent. The U.S. Bureau of Land Management holds 2 percent; and the State of 

Arizona and other public lands comprise 2 percent. Individual and corporate ownership accounts for only 

4 percent of the county. Figure 4-11 illustrates restrictive land ownership patterns that limit prospects for 

growth in the proposed Nonattainment Area. Growth in Pinal County is also defined by land ownership. 

The state owns 35 percent; Tribal lands account for 20 percent; Federally-owned lands account for 18 

percent; other public lands comprise 1 percent. Individual and corporate ownership accounts for 26 

percent. Growth generally occurs in the north central portion of the County in areas contiguous with the 

Phoenix-Mesa-Scottsdale metropolitan area; Indian reservations as well as state and federal lands create 

barriers to contiguous expansion of the urbanized core. Additional growth follows the I-10 and I-8 

corridors, south of the Gila River and Ak-Chin Indian Reservations. 

The rate of growth in the Hayden area has been stagnant over recent decades. Though population of both 

Gila and Pinal Counties is projected to grow significantly, the Hayden area is not. As shown in Table 4-2 

below, growth in the area is projected to remain flat through the potential maintenance period (2011-

2031). 

Table 4-2 

Historical and Projected Population for Gila and Pinal Counties

1990 2000 2008 2015 2031 

Pinal County 179,727 116,397 316,899 486,363 876,091 

Gila County 40,216 51,335 56,427 61,128 70,358 

Globe 6,062 7,486 7,603 7,974 8,647 

Miami 2,018 1,936 1,973 2,022 2,104 

Kearny 2,262 2,449 2,085 2,630 3,774 

Winkelman 676 443 430 430 430 

Hayden 909 892 860 860 860 

Sources: Historical data – U.S. Census Bureau; Projections – Arizona Department of Commerce. 
20

Figure 4-11 

Land Ownership in Gila and Pinal Counties
21

4.6 Meteorology 

Synoptic scale air flows and local topographically driven surface winds influence the speed and direction 

of particulate matter transport throughout the Hayden area. Because the atmosphere within an airshed acts 

in a cohesive way with respect to the dispersion of emissions, local wind patterns and flow are most 

influential in affecting the impact of local particulate emissions. Local wind patterns in the Gila River 

Airshed are greatly influenced by the complex local topography. Hayden is located at the junction of two 

rivers, the Gila and the San Pedro. Situated in a low-lying part of a valley with mountains reaching over 

4,000 feet to the north, east and southwest, Hayden is subject to a distinct mountain-valley diurnal wind 

pattern. Under stable atmospheric conditions, nighttime winds are typically from the southeast with 

speeds less than ten miles per hour. These conditions cause air pooling in low-lying areas at night, 

causing pollutants within the air to settle in these areas. The up-slope air flows and convection that 

occurs during the day increases dispersion and flow out of the Hayden area. Under normal daytime 

conditions, surface winds in the Hayden area range from west-southwesterly to west-northwesterly as the 

atmosphere becomes less stable. This pattern is repeated throughout the complex terrain found in the 

Hayden area. 

During the wintertime, relatively strong inversions (where cold air becomes trapped at the surface by 

warmer air aloft) create extremely stable atmospheric conditions. Depending on the strength of the 

inversion and amount of daytime surface heating, the inversion may break by the early afternoon, 

permitting the air to mix vertically. Sometimes, however, the inversion may not break at all. Under these 

conditions, vertical and horizontal movement of the air is very limited, causing pollutants in the air to 

accumulate up to several days with little dispersion. 

4.7 Geography/Topography 

Hayden lies in the Gila River Valley, approximately 2,044 feet above sea level. The town sits at the base 

of the Dripping Springs Mountains which rise to a height of approximately 5,096 feet. The Mescal and 

Pinal Mountain ranges rise to the east beyond the Dripping Springs range to approximately 7,848 feet in 

elevation at the highest point. To the west of Hayden, the Tortilla Mountains rise to a height of 4,273 feet. 

The complex terrain forms natural boundaries that isolate the Hayden area from most of Gila and Pinal 

Counties. As shown in Figure 4-1 (Page 7), a small range of foothills forms a barrier between Hayden and 

Winkelman, which may reduce the impact of emissions from the operations in Hayden. 

4.8 Jurisdictional Boundaries 

The boundaries recommended by ADEQ for the Pb Nonattainment Area are the same as the existing 

Hayden SO2 Nonattainment Area. Although the proposed Nonattainment Area occupies townships in both 

Pinal and Gila Counties, the area is under ADEQ’s jurisdiction and therefore does not pose jurisdictional 

conflicts. As the state has no jurisdiction within the interior boundaries of Indian reservations, the 

recommended Nonattainment Area excludes all of Indian Country. 

4.9 Level of Control of Emission Sources 

In its analysis ADEQ considered existing control measure applicability areas. In general, emissions 

control programs are implemented at point sources and in areas with violations of the NAAQS. For 

example, the existing Hayden PM10 and SO2 Nonattainment Areas require numerous pollution control 

measures to address air pollution in the Hayden area. Appendix D contains a complete list of control 

measures and technologies required by the operating permit issued by ADEQ for the ASARCO smelter 

and concentrator. The list also includes several existing federally enforceable control measures that were 

included in the Hayden PM10 Nonattainment Area SIP submitted to EPA in September 1989 and the 
22

Hayden SO2 Nonattainment Area SIP submitted to EPA in July 2002. As the forthcoming Pb SIP is 

developed, the status and scope of implementation for each control measure will be reviewed. 

4.10 Nonattainment Area Summary of Criteria Analysis 

ADEQ reviewed the nine criteria outlined in EPA's guidance and determined that portions of Gila and 

Pinal Counties meet the criteria for inclusion in a Pb Nonattainment Area. The recommended area 

includes townships in the existing PM10 and SO2 planning areas. Because the most likely source of the 

high Pb concentrations is the copper concentrating and smelting operations at the ASARCO Ray 

Complex, this area represent the de facto impact area of that facility. Table 4-3 summarizes the data and 

information supporting the Nonattainment Area recommendation. 
23

Table 4-3 

Summary of Nine Criteria Analysis for the Proposed Hayden Pb Nonattainment Area 

Criteria Factors Supporting the Recommended 

Nonattainment Area Boundary 

Factors Supporting the Exclusion of 

Portions of Gila and Pinal Counties 

Air Quality 

Data 

The proposed Nonattainment Area includes the 

location of the Hayden Maintenance Building 

monitor that recorded three Pb concentrations 

exceeding the NAAQS. 

Monitoring data collected in Miami is indeterminate; 

therefore ADEQ is recommending the Miami area be 

designated as attainment/unclassifiable. 

Emissions 

Data 

Emissions data confirm the Hayden ASARCO 

smelter and concentrator is the largest source of 

Pb emissions in the proposed Nonattainment 

Area. 

The two significant stationary sources of Pb emissions 

in Gila County are the Miami and Hayden smelters 

and concentrators. The recommended 

Nonattainment Area is identical to the existing 

Hayden SO2 Nonattainment Area. 

Population 

Density and 

Degree of 

Urbanization 

The area recommended for nonattainment is in 

one of the least populated and undeveloped 

regions of the state. 

Gila County has very low population and employment 

densities. The highest density levels follow areas of 

private land ownership; however, less than 4 percent 

of Gila County is under private ownership. Private 

ownership in Pinal County totals 26 percent; however, 

the eastern regions of the county near Hayden are 

predominantly publicly owned and limit further 

development. 

Traffic and 

Commuting 

Patterns 

The proposed Nonattainment Area includes 

Highways 177 and 77, arterials with the highest 

traffic counts in the area. 

Census data indicates the number of Gila County 

residents commuting to Maricopa, Pima, or Pinal 

Counties account for less than 10 percent of those who 

commute to work within Gila County. In addition, 

since the introduction of unleaded gasoline, traffic is 

no longer a significant source of Pb emissions. 

Growth Rates 

and Patterns 

Significant growth is not projected in the Hayden 

area during the potential mainteance period 

(2011-2031). 

Due to constrained land use patterns, both Gila and 

Pinal Counties have a low potential for growth. 

Meteorology The recommended Nonattainment Area includes 

a portion of the Gila River Airshed where the 

ASARCO Ray Complex is located. 

The regions of Gila and Pinal Counties that are not in 

the Gila River Airshed are not impacted by emissions 

from the ASARCO Ray Complex. 

Geography/ 

Topography 

The proposed Nonattainment Area includes 

portions of the Gila River Airshed where Pb 

emissions originating from the ASARCO smelter 

and concentrator are likely to be dispersed. 

The complex mountainous terrain surrounding the 

Hayden area prevents Pb emissions originating in 

Hayden from affecting other regions of Gila and Pinal 

Counties. 

Jurisdictional 

Boundaries 

The recommended Nonattainment Area is 

continuous with the Hayden SO2 Nonattainment 

Area, excluding that portion within the San 

Carlos Indian Reservation. The recommendation 

requires no new institutional arrangements for 

accomplishing required tasks. Although the 

proposed Nonattainment Area includes townships 

in Pinal and Gila Counties, the area is also under 

the State’s jurisdiction. 

The portions of Gila and Pinal Counties recommended 

as attainment/unclassifiable designation either lack 

significant emission sources or, in the case of the 

Miami area, Pb monitoring data was indeterminate. 

Inclusion of these areas would not help bring the 

Hayden area into attainment. 

Level of 

Control of 

Emission 

Sources 

The existing Hayden PM10 and SO2

Nonattainment Area SIPs require control 

measures to address nonattainment with the 

NAAQS. In addition, the operating permit for the 

ASARCO smelter and concentrator contains 

requirements designed to mitigate particulate 

emissions, including Pb . 

Under the terms of the operating permit issued by 

ADEQ for the ASARCO smelter and concentrator, 

ADEQ has the authority to require the implementation 

of control measures and technologies necessary to 

achieve attainment of the NAAQS in the 

recommended Nonattainment Area. 
24

5.0 AREA DESIGNATION RECOMMENDATIONS 

ADEQ demonstrated in the preceding analysis that most of Arizona should be designated as 

attainment/unclassifiable based on the criteria established by EPA in the 2008 Pb final rule. ADEQ 

considered comments made by Zephyr Environmental Corporation on behalf of ASARCO (see Appendix 

F) and by the Town of Kearny (see Appendix H) prior to making final boundary determinations (for 

ADEQ’s response to Zephyr’s comments, see Appendix G). The proposed Hayden Pb Nonattainment 

Area encompasses all or part of the following 9 townships. Those sections of Gila and Pinal Counties not 

listed below are recommended as attainment/unclassifiable. The state’s proposed Pb Nonattainment Area 

is illustrated in Figure 5-1. 

T4S, R14E; 

T4S, R15E; 

T4S, R16E (except that portion in the San Carlos Indian Reservation); 

T5S, R14E; 

T5S, R15E; 

T5S, R16E (except that portion in the San Carlos Indian Reservation); 

T6S, R14E; 

T6S, R15E; 

T6S, R16E (except that portion in the San Carlos Indian Reservation); 
25

Figure 5-1 

Proposed Hayden Pb Nonattainment Area 
26

Appendix A 

Ambient Monitoring Data 
27

This page is intentionally blank. 
1

Pb-PM10 - Standard Conditions 3-Year Summary Statistics 

Hayden - Maintenance Building AQS# 04-007-8020 AAAD# 137412 

Year Month 

No. of 

Possible 

Samples 

No. of 

Creditable 

Samples 

Monthly 

Data 

Capture 

(%) 

No. of 

Extra 

Samples 

Monthly 

Average 

Lead 

(μg/m3) 

3-Month 

Data 

Capture (%) 

3-Month 

Average 

Lead 

(μg/m3) 

2006-2008 COMPLIANCE VALUES 

October * 2 0 0 0 0 0 0.00 

2006 November * 5 4 80 1 0.1394 27 0.07 

December # 5 2 40 0 0.0865 40 invalid 

January # 5 4 80 0 0.1248 67 invalid 

February ^ 5 5 100 0 0.0158 73 invalid 

March 5 4 80 0 0.0715 87 0.07 

April 5 3 60 0 0.0240 80 0.04 

May ^ 5 4 80 0 0.0348 73 invalid 

June 5 5 100 0 0.0262 80 0.03 

July 6 5 83 0 0.0380 88 0.03 

August 5 5 100 0 0.1234 94 0.06 

September 5 5 100 0 0.1950 94 0.12 

October 5 4 80 1 0.1214 93 0.15 

November 5 5 100 0 0.0874 93 0.13 

2007 

December # 6 2 33 0 0.1525 71 invalid 

January # 5 2 40 0 0.1045 58 invalid 

February ^ 5 3 60 0 0.0377 44 invalid 

March ^ 5 4 80 0 0.0400 60 invalid 

April ^ 5 4 80 2 0.1193 73 invalid 

May 5 5 100 2 0.0756 87 0.08 

June 5 3 60 4 0.0714 80 0.09 

July 5 5 100 3 0.0653 80 0.07 

August ^ 5 3 60 4 0.1560 73 invalid 

September 5 4 80 0 0.2880 80 0.17 

October ^^ 5 4 80 1 0.1162 73 0.19 

November ^^ 5 3 60 3 0.2325 73 0.21 

2008 

December # 5 4 80 1 0.0682 73 invalid 

Invalid 3-month average due to data capture 

Invalid 3-month average due to data capture and insufficient number of samples. 

^ Data Capture <75% and does not pass the above NAAQS test, so this is not a valid 3-month average. 

^^ Data Capture <75% and passes the above NAAQS test and 3-month average is valid. 

# Data Capture <75% and number of samples for month in the design value period is insufficient thus substitution/above 

NAAQS test not done and 3-month average invalid. 

BOLD values denote an exceedance of the NAAQS.
2

Pb-PM10 - Standard Conditions 3-Year Summary Statistics 

Winkelman - Hayden High School Gym AQS# 04-007-8021 AAAD# 137422 

Year Month 

No. of 

Possible 

Samples 

No. of 

Creditable 

Samples 

Monthly 

Data 

Capture 

(%) 

No. of 

Extra 

Samples 

Monthly 

Average 

Lead 

(μg/m3) 

3-Month 

Data 

Capture 

(%) 

3-Month 

Average 

Lead 

(μg/m3) 

2006-2008 COMPLIANCE VALUES 

November * 2 1 50 0 0.0110 17 0.01 2006 

December * 5 3 60 0 0.0240 37 0.02 

January # 5 4 80 0 0.0095 63 invalid 

February 5 5 100 0 0.0224 80 0.02 

March 5 5 100 0 0.0202 93 0.02 

April 5 4 80 0 0.0208 93 0.02 

May 5 4 80 0 0.0478 87 0.03 

June 5 5 100 0 0.0508 87 0.04 

July 6 5 83 0 0.0224 88 0.04 

August 5 3 60 0 0.0287 81 0.03 

September ^ 5 3 60 0 0.0247 68 invalid 

October ^ 5 3 60 0 0.0157 60 invalid 

November ^ 5 1 20 0 0.0190 47 invalid 

2007 

December # 6 0 0 0 0 27 invalid 

January # 5 1 20 0 0.2060 13 invalid 

February ^ 5 2 40 0 0.0165 20 invalid 

March # 5 1 20 0 0.0040 51 invalid 

April # 5 0 0 0 0 20 invalid 

May ^ 5 4 80 1 0.0410 33 invalid 

June ^ 5 5 100 3 0.0303 60 invalid 

July 5 5 100 3 0.0228 93 0.03 

August # 5 1 20 1 0.0320 73 invalid 

September ^ 5 4 80 2 0.0128 67 invalid 

October ^ 5 5 100 3 0.0305 50 invalid 

November 6 4 67 4 0.0295 80 0.01 

2008 

December 5 3 60 2 0.0234 76 0.03 

Invalid 3-month average due to data capture 

Invalid 3-month average due to data capture and insufficient number of samples. 

 * November and December 2006 are not complete as there are no data for the rest of 2006 (mainly September and 

October 2006) and will not be "tested". 

^ Data Capture <75% and does not pass the above NAAQS test, so this is not a valid 3-month average. 

 # Data Capture <75% and number of samples for month in the design value period is insufficient thus substitution/above 

NAAQS test not done and 3-month average invalid. 
3

Hayden PM10 Data in μg/m3 Winkelman PM10 Data in μg/m3

Sample PM10 Pb PM10 Pb 

Date Result Qualifier Result Qualifier 

Sample 

Date Result Qualifier Result Qualifier 

2006 2006 

10/22/06 0.84 0.0024 * 

11/03/06 38.98 0.0266 

11/09/06 37.9 0.0141 

11/11/06 30.62 0.044 

11/21/06 51.53 0.5947 11/21/06 18.25 0.0033 * 

11/27/06 31.58 0.0191 11/27/06 10.39 0.0114 

12/03/06 48.2 0.1595 12/03/06 6.63 0.0027 * 

12/09/06 36.71 12/09/06 8.21 0.003 * 

 12/15/06 12.39 0.0261 

12/21/06 0.46 0.0027 * 12/21/06 11.88 0.0195 

12/27/06 15.01 0.0143 12/27/06 15.66 0.0275 

Average 29.183 0.0897 Average 11.916 0.0134 

2007 2007 

 01/02/07 11.38 0.0153 

01/08/07 39.67 0.47 01/08/07 4.37 0.0027 * 

01/14/07 16.56 0.0167 01/14/07 10.88 0.0109 

01/20/07 12.1 0.0043 01/20/07 6.01 0.0050 

01/26/07 17.36 0.0099 01/26/07 7.29 0.0085 

02/01/07 9.81 0.005 02/01/07 6.45 0.0051 

02/07/07 33.2 0.0103 02/07/07 8.82 0.0140 

02/13/07 18.55 0.037 02/13/07 11.02 0.0329 

02/19/07 27.46 0.0173 02/19/07 22.70 0.0525 

02/25/07 8.64 0.0105 02/25/07 8.60 0.0097 

03/03/07 49.49 0.1444 03/03/07 7.25 0.0030 

03/09/07 R R R R 03/09/07 15.99 0.0178 

03/15/07 37.48 0.032 03/15/07 17.69 0.0185 

03/21/07 67.75 0.0885 03/21/07 25.40 0.0514 

03/27/07 54.27 0.0227 03/27/07 82.41 0.0121 

04/02/07 30.53 0.028 04/02/07 15.56 0.0170 

 04/08/07 43.09 0.0143 

 04/14/07 12.99 0.0027 * 

04/20/07 63.06 0.0122 04/20/07 35.27 0.0050 

04/26/07 34.02 0.0324 04/26/07 22.62 0.0479 

05/02/07 R R R R 05/02/07 R R R 

05/08/07 32.23 0.0774 05/08/07 31.15 0.0798 

05/14/07 45.75 0.0257 05/14/07 28.32 0.0699 

05/20/07 50.34 0.0127 05/20/07 23.01 0.0117 

05/26/07 50.73 0.0253 05/26/07 27.58 0.0325 

06/01/07 91.48 0.046 06/01/07 28.91 0.0724 

06/07/07 51.99 0.0048 06/07/07 42.83 0.0153 

06/13/07 51.31 0.0238 06/13/07 21.33 0.0276 

06/19/07 57.51 0.0298 06/19/07 29.25 0.0573 

06/25/07 47.9 0.0299 06/25/07 26.37 0.0830 

07/01/07 69.08 0.0382 07/01/07 24.90 0.0465 

07/07/07 R R R R 07/07/07 17.90 0.0076 

07/13/07 35.27 0.021 07/13/07 27.11 0.0256 

07/19/07 46.16 0.0986 07/19/07 27.28 0.0266 
4

Hayden PM10 Data in μg/m3 Winkelman PM10 Data in μg/m3

Sample PM10 Pb PM10 Pb 

Date Result Qualifier Result Qualifier 

Sample 

Date Result Qualifier Result Qualifier 

07/25/07 25.2 0.0136 07/25/07 16.22 0.0080 

07/31/07 19.49 0.0208 

08/06/07 9.78 0.0142 08/06/07 1.53 0.0024 * 

08/12/07 39.68 0.0268 08/12/07 12.47 0.0272 

08/18/07 45.27 0.0429 08/18/07 21.93 0.0342 

08/24/07 32.48 0.0182 08/24/07 21.81 0.0257 

08/30/07 39.05 0.517 08/30/07 8.36 0.0024 * 

09/05/07 48.19 0.0294 09/05/07 25.12 0.0177 

09/11/07 44.89 0.8362 09/11/07 6.68 0.0024 * 

09/17/07 45.13 0.0803 09/17/07 35.27 0.003 * 

09/23/07 17.65 0.0033 09/23/07 16.16 0.0146 

09/29/07 43.35 0.0273 09/29/07 24.66 0.0438 

10/05/07 24.62 0.0035 10/05/07 17.34 0.0040 

10/11/07 32.19 0.046 

10/17/07 59.08 0.0194 10/17/07 44.04 0.0255 

10/22/07 54.57 0.5156 

10/27/07 34.06 0.0242 10/27/07 14.24 0.0186 

11/01/07 32.98 0.0202 11/01/07 30.86 0.0196 

11/07/07 69.12 0.3183 

11/13/07 53.97 0.0049 

11/19/07 55.97 0.042 

11/25/07 28.99 0.0538 

12/07/07 13.13 0.2119 

12/13/07 23.6 0.0944 

Average 39.27 0.0838 Average 21.43 0.0240 

2008 2008 

01/12/08 25.89 0.1487 01/12/08 17.61 0.2067 

01/18/08 18.26 0.0613 

02/17/08 11.11 0.0291 02/17/08 10.44 0.0181 

02/23/08 8.32 0.0081 02/23/08 9.8 0.0155 

02/29/08 19.6 0.0764 

03/06/08 13.64 0.0697 

03/12/08 R R R 

03/14/08 37.8 0.064 

03/20/08 29.53 0.0152 

03/26/08 28.67 0.0125 

 03/28/08 2.19 0.0024 * 

03/30/08 1.16 0.0024 * 

 03/31/08 12.47 0.0044 

04/05/08 29.05 0.0305 

04/12/08 29.12 0.4627 

04/15/08 33.35 0.059 

04/18/08 44.78 0.1272 

04/21/08 26.71 0.0299 

04/24/08 24.15 0.0097 

05/10/08 56.63 0.022 

05/13/08 40.06 0.1163 

05/16/08 23.85 0.288 05/16/08 17.8 0.0101 
5

Hayden PM10 Data in μg/m3 Winkelman PM10 Data in μg/m3

Sample PM10 Pb PM10 Pb 

Date Result Qualifier Result Qualifier 

Sample 

Date Result Qualifier Result Qualifier 

05/19/08 32.67 0.0236 05/19/08 15.58 0.0309 

05/22/08 93.75 0.0166 05/22/08 26.05 0.0375 

05/28/08 24.63 0.0361 05/28/08 59.53 0.0301 

05/31/08 30 0.028 05/31/08 24.74 0.0986 

06/03/08 33.15 0.0547 

06/06/08 17.26 0.0185 

06/09/08 34.74 0.0843 06/09/08 12.45 0.0227 

06/12/08 53.37 0.0746 06/12/08 26.09 0.0246 

06/15/08 60.94 0.1255 06/15/08 31.39 0.0459 

06/18/08 40.22 0.033 06/18/08 26.51 0.0586 

06/21/08 60.24 0.1123 06/21/08 34.04 0.0264 

 06/24/08 32.37 0.0579 

 06/27/08 13.32 0.0075 

 06/30/08 11.06 0.0032 

 07/03/08 26.58 0.0294 

 07/06/08 17.76 0.0141 

07/09/08 28.62 0.3432 07/09/08 6.56 0.0027 * 

07/12/08 12.91 0.0062 07/12/08 10.33 0.0067 

07/15/08 24.81 0.0191 07/15/08 16.18 0.0175 

07/18/08 32.8 0.047 

07/21/08 11.37 0.0205 07/21/08 7.54 0.01 

07/24/08 18.32 0.0731 07/24/08 12.61 0.0721 

07/27/08 25.49 0.0011 07/27/08 19.92 0.0089 

07/30/08 23.55 0.0132 07/30/08 19.42 0.0261 

08/02/08 24.29 0.0347 08/02/08 21.55 0.0349 

08/05/08 32.16 0.1629 

08/08/08 40.84 0.457 

08/11/08 35.79 0.0417 

08/14/08 15.99 0.1646 

08/17/08 23.43 0.1981 

08/20/08 32.1 0.0363 

 08/23/08 16.38 0.0306 

 08/29/08 9.26 0.003 * 

 09/01/08 9.2 0.0153 

 09/04/08 16.02 0.0163 

 09/07/08 10.13 0.0067 

09/12/08 40.7 0.0136 09/12/08 35.42 0.0082 

09/18/08 29.01 0.0462 09/18/08 11.63 0.0189 

09/24/08 34.77 0.1263 09/24/08 10.43 0.0141 

09/30/08 56.77 0.9676 09/30/08 19.94 0.0033 * 

10/06/08 32.73 0.02 10/06/08 17.35 0.0201 

10/12/08 24.23 0.0234 

 10/13/08 16.09 0.0529 

 10/16/08 9.58 0.0124 

 10/19/08 12.96 0.0247 

10/22/08 48.73 0.1968 10/22/08 17.79 0.0100 

10/25/08 29.92 0.042 10/25/08 17.34 0.0382 

10/28/08 45.02 0.3002 10/28/08 19.02 0.0041 
6

Hayden PM10 Data in μg/m3 Winkelman PM10 Data in μg/m3

Sample PM10 Pb PM10 Pb 

Date Result Qualifier Result Qualifier 

Sample 

Date Result Qualifier Result Qualifier 

 10/31/08 20.63 0.0848 

 11/03/08 15.95 0.0109 

 11/06/08 10.4 0.0144 

11/09/08 177.21 0.0887 11/09/08 77.09 0.0824 

11/12/08 32.81 0.0071 11/12/08 16.87 0.0263 

 11/15/08 23.72 0.0033 * 

 11/18/08 13.77 0.0033 * 

11/21/08 100.34 0.984 11/21/08 43.55 0.0030 

11/24/08 37.59 0.111 11/24/08 16.64 0.0066 

11/27/08 14.12 0.1731 11/27/08 7.43 0.0314 

11/30/08 21.24 0.0328 11/30/08 12.91 0.0647 

 12/03/08 12.2 0.0377 

12/06/08 14.830 0.0113 12/06/08 9.43 0.0266 

 12/09/08 12.7 0.0285 

12/12/08 17.500 0.1094 12/12/08 8.583 0.0103 

12/15/08 20.500 0.1166 

 12/24/08 9.042 0.0168 

12/27/08 9.747 0.0944 

12/30/08 13.330 0.0115 

Average 33.326 0.1128 Average 18.36 0.0276 

* = The result is less than three times the level of uncertainty. 

NA = Not available 

R = Rejected due to filter damage 
7

Pb-PM10 Standard Conditions 3-Year Summary Statistics 

JLG Supersite AQS# 04-013-9997 AAAD# 16328 

Year Month 

No. of 

Possible 

Samples 

No. of 

Creditable 

Samples 

Monthly 

Data 

Capture 

(%) 

No. of 

Extra 

Samples 

Monthly 

Average 

Lead 

(μg/m3) 

3-Month 

Data 

Capture (%) 

3-Month 

Average Lead 

(μg/m3) 

2006-2008 COMPLIANCE VALUES 

January * 5 5 100 0 0.0055 33 0.01 

February ** 5 4 80 0 0.0060 60 0.01 

March 5 5 100 0 0.0022 93 0.00 

April 5 5 100 0 0.0032 93 0.00 

May 5 5 100 0 0.0032 100 0.00 

June 5 4 80 0 0.0030 93 0.00 

July 5 5 100 0 0.0018 93 0.00 

August 5 5 100 0 0.0028 93 0.00 

September 5 5 100 0 0.0026 100 0.00 

October 5 5 100 0 0.0026 100 0.00 

November 5 5 100 0 0.0080 100 0.00 

2006 

December 6 6 100 0 0.0085 100 0.01 

January 5 5 100 0 0.0040 100 0.01 

February 4 4 100 0 0.0038 100 0.01 

March 6 6 100 0 0.0035 100 0.00 

April 5 4 80 0 0.0045 93 0.00 

May 5 5 100 0 0.0028 93 0.00 

June 5 5 100 0 0.0042 93 0.00 

July 5 5 100 0 0.0040 100 0.00 

August 5 4 80 0 0.0025 93 0.00 

September 5 5 100 0 0.0026 93 0.00 

October 5 5 100 0 0.0044 93 0.00 

November 5 5 100 0 0.0086 100 0.01 

2007 

December 5 5 100 0 0.0058 100 0.01 

January 6 6 100 0 0.0028 100 0.01 

February 4 4 100 0 0.0063 100 0.00 

March 6 5 83 0 0.0040 94 0.00 

April 5 4 80 0 0.0080 88 0.01 

May 5 5 100 0 0.0046 88 0.01 

June 5 5 100 0 0.0036 93 0.01 

July 5 4 80 0 0.0018 93 0.00 

August 5 4 80 0 0.0015 87 0.00 

September 5 4 80 0 0.0038 80 0.00 

October 5 5 100 0 0.0044 87 0.00 

November 5 5 100 0 0.0066 93 0.00 

2008 

December 5 5 100 0 0.0052 100 0.01 

* January 2006 is not complete as there are no data for November and December 2005. 

** February 2006 is not complete as there are no data for December 2005. 

Invalid 3-month average due to data capture.

Invalid 3-month average due to data capture and insufficient number of samples.
8

JLG Supersite PM10 Data in (μg/m3) 

Sample PM10 Pb 

Date Result Qualifier Result Qualifier 

2006 

1/5/2006 39 0.005

1/11/2006 60 0.008

1/17/2006 41 0.005

1/23/2006 35 0.004

2/1/2006 47 0.007

2/4/2006 AN AN 

2/10/2006 41 0.005

2/16/2006 62 0.004

2/22/2006 45 0.008

2/28/2006 34 0.006

3/9/2006 24 0.002

3/12/2006 9 0.001

3/18/2006 21 0.002

3/24/2006 27 0.004

3/30/2006 22 0.002

4/5/2006 35 0.002

4/11/2006 24 0.004

4/17/2006 32 0.003

4/23/2006 28 0.003

4/29/2006 27 0.004

5/5/2006 31 0.003

5/11/2006 43 0.004

5/19/2006 30 0.003

5/23/2006 27 0.004

5/29/2006 27 0.002

6/4/2006 35 0.003

6/10/2006 20 0.002

6/16/2006 28 0.005

6/27/2006 31 0.002

6/28/2006 AF AF 

7/4/2006 26 0.002

7/10/2006 23 0.002

7/16/2006 69 0.002

7/22/2006 28 0.002

7/28/2006 16 0.001

8/3/2006 29 0.002

8/9/2006 57 0.003

8/15/2006 19 0.003

8/21/2006 44 0.004

8/27/2006 21 0.002

9/2/2006 25 0.003

9/8/2006 10 0.001

9/14/2006 20 0.003

9/20/2006 29 0.002

9/26/2006 32 0.004
9

JLG Supersite PM10 Data in (μg/m3) 

Sample PM10 Pb 

Date Result Qualifier Result Qualifier 

10/2/2006 31 0.005

10/8/2006 26 0.002

10/14/2006 15 0.001

10/20/2006 37 0.004

10/26/2006 16 0.001

11/1/2006 51 0.006

11/7/2006 57 0.007

11/13/2006 55 0.009

11/19/2006 53 0.01

11/25/2006 38 0.008

12/1/2006 70 0.01

12/7/2006 44 0.005

12/13/2006 67 0.009

12/19/2006 33 0.005

12/25/2006 46 0.005

12/31/2006 91 0.017

2007 

1/9/2007 30 0.004

1/12/2007 26 0.002

1/18/2007 25 0.005

1/24/2007 38 0.006

1/30/2007 19 0.003

2/5/2007 29 0.005

2/11/2007 31 0.005

2/17/2007 22 0.003

2/23/2007 27 0.002

3/1/2007 22 0.002

3/7/2007 40 0.005

3/13/2007 43 0.005

3/19/2007 28 0.003

3/25/2007 16 0.003

3/31/2007 22 0.003

4/6/2007 33 

4/12/2007 85 a 0.006 (a) 

4/18/2007 45 0.006

4/24/2007 14 0.002

4/30/2007 33 0.004

5/6/2007 14 0.001

5/12/2007 32 0.003

5/18/2007 31 0.004

5/24/2007 31 0.003

5/30/2007 31 0.003

6/5/2007 43 0.005

6/11/2007 30 0.007

6/17/2007 31 0.004

6/23/2007 30 0.002
10

JLG Supersite PM10 Data in (μg/m3)

Sample PM10 Pb 

Date Result Qualifier Result Qualifier 

6/29/2007 27 0.003

7/5/2007 44 0.006

7/11/2007 28 0.004

7/17/2007 46 0.003

7/23/2007 36 0.004

7/29/2007 14 0.003

8/8/2007 29 0.003

8/10/2007 AN AF (AN) 

8/16/2007 28 0.002

8/22/2007 27 0.002

8/28/2007 27 0.003

9/3/2007 23 0.002

9/9/2007 28 0.002

9/15/2007 48 0.003

9/21/2007 42 0.002

9/27/2007 33 0.004

10/3/2007 30 0.004

10/9/2007 37 0.004

10/15/2007 36 0.004

10/21/2007 57 0.005

10/27/2007 43 0.005

11/2/2007 56 0.008

11/8/2007 70 0.012

11/14/2007 47 0.006

11/20/2007 49 0.009

11/26/2007 50 0.008

12/4/2007 45 0.006

12/8/2007 17 0.002

12/14/2007 25 0.003

12/20/2007 40 0.012

12/26/2007 30 0.006

2008 

01/01/2008 13 0.001

01/07/2008 10 0.001

01/13/2008 29 0.005

01/19/2008 33 0.006

01/25/2008 16 0.003

01/31/2008 10 0.001

02/06/2008 24 0.006

02/12/2008 40 0.011

02/18/2008 33 0.004

02/24/2008 22 0.004

03/01/2008 30 0.008

03/07/2008 26 0.003

03/13/2008 33 0.005

03/19/2008 AF (AF) 
11

JLG Supersite PM10 Data in (μg/m3)

Sample PM10 Pb 

Date Result Qualifier Result Qualifier 

03/29/2008 31 0.002

03/31/2008 34 0.002

04/06/2008 27 0.008

04/12/2008 20 0.007

04/18/2008 AJ AJ 

04/24/2008 41 0.009

04/30/2008 33 0.008

05/06/2008 22 0.007

05/12/2008 49 0.009

05/18/2008 23 0.003

05/24/2008 22 0.001

05/30/2008 28 0.003

06/05/2008 102 0.003

06/11/2008 31 0.002

06/17/2008 39 0.004

06/23/2008 34 0.004

06/29/2008 31 0.005

07/05/2008 23 0.001

07/11/2008 AS AM (AS) 

07/17/2008 22 0.002

07/23/2008 24 0.003

07/29/2008 23 0.001

08/04/2008 27 0.001

08/10/2008 38 0.001

08/16/2008 17 0.002

08/22/2008 30 0.002

08/28/2008 AV AV 

09/03/2008 AN AN 

09/09/2008 24 0.003

09/15/2008 21 0.003

09/21/2008 19 0.001

09/27/2008 25 0.008

10/03/2008 38 0.003

10/09/2008 31 0.005

10/15/2008 19 0.002

10/21/2008 30 0.004

10/27/2008 65 0.008

11/02/2008 34 0.008

11/08/2008 38 0.006

11/14/2008 38 0.006

11/20/2008 44 0.006

11/26/2008 26 0.007

12/04/2008 41 0.009

12/08/2008 34 0.008

12/14/2008 23 0.002

12/20/2008 38 0.006
12

JLG Supersite PM10 Data in (μg/m3)

Sample PM10 Pb 

Date Result Qualifier Result Qualifier 

12/26/2008 38 0.001

EPA Air Quality System (AQS) Missing Value and Qualifier codes: 

a Exceptional Event flag requested for this sample 

AF Scheduled but not collected 

AJ Filter Damage 

AM Miscellaneous Void 

AN Machine Malfunction 

AS Poor Quality Assurance Results 
1

Appendix B 

3-Month Average Lead Concentration Calculations 

For the Hayden Maintenance Yard Monitor 
1

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Appendix B 

3-Month Average Lead Concentration Calculations 

For the Hayden Maintenance Yard Monitor 

 

2007 Monthy/3-Month Summary – Pb-PM10 Standard Conditions 

Invalid 3-month average due to data capture 

Invalid 3-month average due to data capture and insufficient number of samples. 

Month 

No. of 

Possible 

Samples 

No. of 

Creditable 

Samples 

Monthly 

Data 

Capture 

(%) 

No. of 

Extra 

Samples 

Monthly 

Average 

Lead 

(μg/m3) 

3-Month 

Data 

Capture 

(%) 

3-Month 

Average 

Lead 

(μg/m3) 

January # 5 4 80 0 0.1248 67 0.12 

February ^ 5 5 100 0 0.0158 73 0.08 

March 5 4 80 0 0.0715 87 0.07 

April 5 3 60 0 0.0240 80 0.04 

May ^ 5 4 80 0 0.0348 73 0.04 

June 5 5 100 0 0.0262 80 0.03 

July 6 5 83 0 0.0380 88 0.03 

August 5 5 100 0 0.1234 94 0.06 

September 5 5 100 0 0.1950 94 0.12 

October 5 4 80 1 0.1214 93 0.15 

November 5 5 100 0 0.0874 93 0.13 

December # 6 2 33 0 0.1525 71 0.12 

 Valid 3-month average (may include data substitution). 

^ Data Capture <75% and average is below the NAAQS, so data substitution is not allowed. As a result, 

this is not a valid 3-month average. 

# Data Capture <75% and number of samples for month in the design value period is insufficient; thus 

data substitution [See 40 CFR 50 Appendix R § 4(c)(ii)(A)] not done and 3-month average is invalid. 

 

Above the NAAQS test - February 2007 

Month 

No. of 

Possible 

Samples 

No. of 

Creditable 

Samples 

Monthly 

Data 

Capture 

(%) 

No. of 

Extra 

Samples 

Monthly 

Average 

Lead 

(μg/m3) 

3-Month 

Data 

Capture 

(%) 

3-Month 

Average 

Lead 

(μg/m3) 

December ~ 5 3 60 0 0.0613 

January 5 4 80 0 0.1248 

February 5 5 100 0 0.0158 80 0.07 

~ December had 1 sample substituted with 0.011 μg/m3 from 12/6/2008 for 2006-2008 Design Value 

period to get the February 2007 Data Capture >75%. 

Above the NAAQS test - May 2007 

Month 

No. of 

Possible 

Samples 

No. of 

Creditable 

Samples 

Monthly 

Data 

Capture 

(%) 

No. of 

Extra 

Samples 

Monthly 

Average 

Lead 

(μg/m3) 

3-Month 

Data 

Capture 

(%) 

3-Month 

Average 

Lead 

(μg/m3) 

March 5 4 80 0 0.0715 

April ~ 5 4 80 0 0.0203 

May 5 4 80 0 0.0348 80 0.04 

~ April had 1 sample substituted with 0.009 μg/m3 from 4/24/2008 for 2006-2008 Design Value period to 

get the May 2007 Data Capture >75%. 
 

2008 Monthy/3-Month Summary – Pb-PM10 Standard Conditions 

Invalid 3-month average due to data capture 

Invalid 3-month average due to data capture and insufficient number of samples. 

Month 

No. of 

Possible 

Samples 

No. of 

Creditable 

Samples 

Monthly 

Data 

Capture 

(%) 

No. of 

Extra 

Samples 

Monthly 

Average 

Lead 

(μg/m3) 

3-Month 

Data 

Capture 

(%) 

3-Month 

Average 

Lead 

(μg/m3) 

January # 5 2 40 0 0.1045 58 0.11 

February ^ 5 3 60 0 0.0377 44 0.10 

March ^ 5 4 80 0 0.0400 60 0.06 

April ^ 5 4 80 2 0.1193 73 0.07 

May 5 5 100 2 0.0756 87 0.08 

June 5 3 60 4 0.0714 80 0.09 

July 5 5 100 3 0.0653 80 0.07 

August ^ 5 3 60 4 0.1560 73 0.10 

September 5 4 80 0 0.2880 80 0.17 

October ^^ 5 4 80 1 0.1162 73 0.19 

November ^^ 5 3 60 3 0.2325 73 0.21 

December # 5 4 80 1 0.0682 73 0.14 

 Valid 3-month average (may include data substitution). 

^ Data Capture <75% and average is below the NAAQS, so data substitution is not allowed. As a result, this is not a 

valid 3-month average. 

^^ Data Capture <75% and average is the above the NAAQS; 40 CFR 50 Appendix R § 4(c)(ii)(A) allows use of the 

LOWEST data value recorded during the same month over the design period as a substitute for the missing 

sample(s) up to minimum 75% data capture. This 3-month average is valid. 

# Data Capture <75% and number of samples for month in the design value period is insufficient; thus, data 

substitution not done and 3-month average is invalid. 

 

Above the NAAQS test - February 2008 

Month 

No. of 

Possible 

Samples 

No. of 

Creditable 

Samples 

Monthly 

Data 

Capture 

(%) 

No. of 

Extra 

Samples 

Monthly 

Average 

Lead 

(μg/m3) 

3-Month 

Data 

Capture 

(%) 

3-Month 

Average 

Lead 

(μg/m3) 

December ~ 6 6 100 0 0.0522 

January ~ 5 4 80 0 0.0543 

February 5 3 60 0 0.0377 80 0.05 

~ December had 4 samples substituted with 0.002 μg/m3 from 12/21/2006 and January had 2 samples substituted 

with 0.004 μg/m3 from 1/20/2007 for 2006-2008 Design Value period to get the February 2008 Data Capture >75%. 

 

Above the NAAQS test - March 2008 

Month 

No. of 

Possible 

Samples 

No. of 

Creditable 

Samples 

Monthly 

Data 

Capture 

(%) 

No. of 

Extra 

Samples 

Monthly 

Average 

Lead 

(μg/m3) 

3-Month 

Data 

Capture 

(%) 

3-Month 

Average 

Lead 

(μg/m3) 

January ~ 5 5 100 0 0.0442 

February 5 3 60 0 0.0377 

March 5 4 80 1 0.0400 80 0.04 

~ January had 3 samples substituted with 0.004 μg/m3 from 1/20/2007 for 2006-2008 Design Value period to get the 

March 2008 Data Capture >75%. 
Above the NAAQS test - April 2008 

Month 

No. of 

Possible 

Samples 

No. of 

Creditable 

Samples 

Monthly 

Data 

Capture 

(%) 

No. of 

Extra 

Samples 

Monthly 

Average 

Lead 

(μg/m3) 

3-Month 

Data 

Capture 

(%) 

3-Month 

Average 

Lead 

(μg/m3) 

February ~ 5 4 80 0 0.0295 

March 5 4 80 1 0.0400 

April 5 4 80 2 0.1193 80 0.06 

~ February had 1 sample substituted with 0.005 μg/m3 from 2/1/2007 for 2006-2008 Design Value period to get the 

April 2008 Data Capture >75%. 

Above the NAAQS test - August 2008 

Month 

No. of 

Possible 

Samples 

No. of 

Creditable 

Samples 

Monthly 

Data 

Capture 

(%) 

No. of 

Extra 

Samples 

Monthly 

Average 

Lead 

(μg/m3) 

3-Month 

Data 

Capture 

(%) 

3-Month 

Average 

Lead 

(μg/m3) 

June ~ 5 4 80 4 0.0630 

July 5 5 100 3 0.0653 

August 5 3 60 4 0.1560 80 0.09 

~ June had 1 sample substituted with 0.004 μg/m3 from 6/7/2007 for 2006-2008 Design Value period to get the 

August 2008 Data Capture >75%. 

Above the NAAQS test - October 2008 

Month 

No. of 

Possible 

Samples 

No. of 

Creditable 

Samples 

Monthly 

Data 

Capture 

(%) 

No. of 

Extra 

Samples 

Monthly 

Average 

Lead 

(μg/m3) 

3-Month 

Data 

Capture 

(%) 

3-Month 

Average 

Lead 

(μg/m3) 

August ~ 5 4 80 4 0.1383 

September 5 4 80 0 0.2880 

October 5 4 80 1 0.1162 80 0.18 

~ August had 1 sample substituted with 0.014 μg/m3 from 8/6/2007 for 2006-2008 Design Value period to get the 

October 2008 Data Capture >75%. 

Above the NAAQS test - November 2008 

Month 

No. of 

Possible 

Samples 

No. of 

Creditable 

Samples 

Monthly 

Data 

Capture 

(%) 

No. of 

Extra 

Samples 

Monthly 

Average 

Lead 

(μg/m3) 

3-Month 

Data 

Capture 

(%) 

3-Month 

Average 

Lead 

(μg/m3) 

September 5 4 80 0 0.2880 

October 5 4 80 1 0.1162 

November ~ 5 4 80 3 0.1999 80 0.20 

~ November had 1 sample substituted with 0.004 μg/m3 from 11/13/2007 for 2006-2008 Design Value period to get 

the November 2008 Data Capture >75%. 
1

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1

Appendix C 

CH2M Hill Technical Memorandum: Preliminary Evaluation of PM10 and Metals 

Concentrations from October 2007 to December 2008 in Ambient Air at the Hayden 

and Winkelman Monitoring Stations 
1

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PHX/\\MADISON\PROJ\USEPA\335404WA298ASARCO\GSA CONTRACT\DATA EVALUATION REPORT\FINAL REPORT\AIR DATA EVALUATION REPORT.DOC 1 

 T E C H N I C A L M E M O R A N D U M 

Preliminary Evaluation of PM10 and Metals 

Concentrations from October 2007 to December 2008 

in Ambient Air at the Hayden and Winkelman 

Monitoring Stations 

ASARCO LLC Hayden Plant Site, Arizona 

PREPARED FOR: John Hillenbrand/ US EPA 

PREPARED BY: Prabhat Bhargava/CH2M HILL 

COPIES: Allan Erickson/CH2M HILL 

DATE: December 31, 2008 

PROJECT NUMBER: 381679 

Introduction 

The purpose of this Technical Memorandum (TM) is to provide an updated evaluation of air 

data collected after the “Remedial Investigation Report for the ASARCO LLC Hayden Plant Site” 

(RI Report, CH2M HILL, August 2008) was produced. The RI Report presented the air 

monitoring results for the period October 22, 2006 through November 7, 2008. This TM 

describes the air monitoring results for PM10 and selected metals (including arsenic, lead, 

copper, cadmium, and chromium) collected at the Hayden and Winkelman stations during 

the period of November 13, 2007 through December 9, 2008. 

The air investigation involves collection of meteorological, PM10, and metals data from two 

air monitors installed as part of this study. The Hayden monitoring station was placed on 

the roof of the Town of Hayden maintenance building. The Winkelman monitoring station 

was placed on the roof of the Hayden High School gymnasium (located in Winkelman). 

The air monitoring stations were programmed to collect samples on pre-loaded filters for a 

24-hour period from midnight to midnight. One 24-hour sample was collected every 6th-day 

until an increase of sampling frequency (every 3rd-day) was implemented on March 28, 2008. 

The meteorological data (average ambient temperature, relative humidity, wind speed, and 

wind direction) are collected every 30 minutes on a continuous daily basis. 

The sample filters collected during these periods were submitted for analysis of PM10 by 

gravimetric method and for metals analysis of the PM10 fraction by EPA Compendium 

Method IO-3.3 using X-ray Fluorescence Spectroscopy. All laboratory analyses were 

conducted by Chester LabNet of Tigard, Oregon. 

Sample collection was not available from November 13, 2007 to January 12, 2008 and April 

1, 2008 to May 15, 2008 at the Winkelman station due to air sampling pump failure within 
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the unit, which required replacement of the pump. Furthermore, due to apparent power 

surging issues at the Hayden station, 13 samples (October through December 2008) were not 

collected. 17 air filter samples were rejected because of torn filters received at the laboratory 

or the quantitation limits for some analytes were rejected due to QC outliers that did not 

meet the minimum requirements for acceptability. Despite the absence of these Hayden and 

Winkelman samples, the resulting data set is considered sizable enough for evaluation 

purposes in this TM. 

The air monitoring results from the Hayden and Winkelman air monitoring stations are 

compared with background concentrations from the Organ Pipe National Monument 

station, as provided in the RI Report. The existing background dataset referenced in the RI 

Report was used for the current evaluation in this TM. 

Air Quality Results in Hayden and Winkelman Stations 

Following validation of the laboratory data, summary tables were created containing the 

results and any data qualifiers. Tables 1 and 2 provide a summary of the air sampling 

results for PM10 and metals for the Hayden and Winkelman stations, respectively. These 

tables also show the regulatory comparison criteria and a 24-hour windrose for each day 

PM10 samples were collected. 

The metals results reported by Chester LabNet include an uncertainty value, in accordance 

with the XRF analytical procedure in EPA Method IO-3.3. The uncertainty measurement 

represents the statistical range in which a measurement may fall. For a Gaussian 

distribution, a one-sigma uncertainty would describe the range of possible values (by 

adding and subtracting the uncertainty to the reported value) with 68% confidence, while a 

three-sigma uncertainty would describe the range at 99.7% confidence. The uncertainties 

reported by the laboratory are one sigma uncertainties. Based on discussions with the 

laboratory and a review of practices used to evaluate air quality data at other sites, a three 

sigma uncertainty was used for review of data for this Site. When a measured value is above 

the three-sigma MDL uncertainty, it is considered a detected result, and is reported as is. If 

it is found below the three-sigma uncertainty, it is considered a nondetected result, and the 

three-sigma uncertainty value is provided in the summary tables. For some samples, the 

three-sigma MDL uncertainty is above the regulatory criteria, as indicated in Tables 1 and 2. 

This data evaluation approach is identical to the one followed in the RI Report. 

In general, the concentrations of PM10 and metals at the two stations were likely affected by 

relative locations of the emission sources, the variation of the emission rates of the sources, 

and meteorological conditions such as wind direction and speed. 

PM10 Concentration Summary 

Following data validation there are 54 available results for PM10 at the Hayden station and 

54 results available for the Winkelman station. The average PM10 value for the Hayden 

station (34.7 μg/m3) over this period is about 1.9 times the average PM10 value at the 

Winkelman station (17.9 μg/m3). These concentrations both exceed the Organ Pipe station 

background average value (16 μg/m3). 

Figure 1 shows the comparison of PM10 concentrations at the two RI stations and the 

average wind speed monitored at the Hayden station (since wind speeds were generally 
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similar at both stations). In general, PM10 concentrations were observed to be higher at the 

Hayden station than the Winkelman station. No elevated concentrations of PM10 were 

measured at the Winkelman station if the wind was not blowing from the direction of 

smelter, concentrator or tailing piles. The highest or lowest PM10 concentrations at both 

monitoring stations did not necessarily occur on days with the highest or lowest wind 

speed, respectively. 

The highest concentrations of PM10 were found on November 9, 2008 at both the Hayden 

(177.2 μg/m3) station and the Winkelman (77.1 μg/m3) station. The measured PM10

concentration at the Hayden station on November 9, 2008 exceeded the NAAQS 24-hour 

PM10 value of 150 μg/m3. The windrose diagrams, provided in Tables 1 and 2, indicate that 

the average wind speed on November 9, 2008 was moderate to high. For the Hayden 

station, upwind sources of PM10 emissions during the higher wind speed on that day 

included the tailings impoundments (to the southwest), open areas west of Hayden (to the 

west), and the track hopper, CF and Conveyer 9 area (to the southeast). For the Winkelman 

station, upwind sources of PM10 emissions included open spaces and tailings 

impoundments (to the south and west). 

Metal Concentrations Summary 

The concentrations of metals in the PM10 filters, including arsenic, lead, copper, and 

chromium, were evaluated for both the Hayden and Winkelman stations. The 

concentrations of arsenic, lead, copper, and chromium during the monitoring period are 

shown in Figures 2 through 5, respectively. 

Arsenic Concentrations at Hayden Station. Of the 54 samples collected in Hayden during the 

reporting period and analyzed for metals, 46 (85%) exceeded the arsenic ambient air PRG of 

0.00045 μg/m3. The five most elevated arsenic concentrations were found on November 24, 

2008 (0.0469 μg/m3); August 5, 2008 (0.0518 μg/m3); April 12, 2008 (0.0970 μg/m3); May 16, 

2008 (0.0830 μg/m3); September 30, 2008 (0.1554 μg/m3). 

During most of these sample periods, the prevailing wind direction was from the northeast, 

and the ASARCO smelter facility was generally upwind. The maximum arsenic 

concentration (0.1554 μg/m3 on September 30, 2008) is about 345 times the ambient air PRG. 

Although the Hayden station sample from November 09, 2008 (177.21 μg/m3) had the 

highest PM10 reading, an elevated concentration of arsenic was not found on this day. 

The average arsenic concentration at the Hayden station (0.0209 μg/m3) is about 35-70 times 

higher than the range of arsenic MDL values (0.0003 – 0.0006 μg/m3) at the Organ Pipe 

station, as described in the RI Report. 

Arsenic Concentrations at Winkelman Station. Of the 54 samples collected in Winkelman 

during the reporting period and analyzed for metals, 43 (80%) exceeded the arsenic ambient 

air PRG of 0.00045 μg/m3. As shown on Table 2, the five most elevated arsenic 

concentrations were found on January 12, 2008; June 24, 2008; August 2, 2008; November 9, 

2008; and November 30, 2008 (highest). 

During most of these sample periods, the prevailing wind direction was from the northwest, 

and the ASARCO smelter and concentrator facilities were generally upwind. The maximum 

arsenic concentration (0.0339 μg/m3, measured on November 30, 2008) is about 77 times the 
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PRG, and about 6.7 times lower than the maximum value recorded in Hayden over this 

period. Also, the elevated arsenic concentration days in Hayden and Winkelman did not 

coincide. 

The average arsenic concentration at the Winkelman station (0.008 μg/m3) is about 13-26 

times higher than the range of MDL values (0.0003 – 0.0006 μg/m3) at the Organ Pipe 

station, as described in the RI Report . 

Lead Concentrations in Hayden and Winkelman. USEPA made revisions to the primary and 

secondary National Ambient Air Quality Standards (NAAQS) for lead (Pb) on October 15, 

2008. With regard to the primary standard, USEPA has revised the level to 0.15 μg/m3. The 

revised standard is 1/10th of the previous standard. USEPA retained the current indicator 

of lead in total suspended particles (Pb-TSP). USEPA revised the averaging time to a rolling 

3-month period with a maximum (not-to be- exceeded) form. USEPA has revised the 

secondary standard to be identical in all respects to the revised primary standard. Even 

though a complete three month data set has not been collected for lead since promulgation 

of new standard, the collected data was compared to revised NAAQS for lead. 

As shown in Figure 3, the concentration pattern for lead in the Hayden and Winkelman 

samples was very similar to arsenic, with the elevated concentrations occurring on the same 

dates. The maximum lead concentration (0.968 μg/m3 on September 30, 2008) in Hayden 

(Table 1) corresponded to the same sample for which the maximum arsenic concentration 

was found; this lead concentration in the PM10 sample is about 6.5 times the lead NAAQS of 

0.15 μg/m3 (rolling 3-month average value). The average lead concentration in Hayden 

(0.101 μg/m3) is about 76 times the Organ Pipe station average background value of 

0.00133 μg/m3. The three-month rolling average concentrations for lead at the Hayden 

monitoring station for the months that ended in September 2008 (0.172 μg/m3), October 

2008 (0.184 μg/m3) and November 2008 (0.152 μg/m3) exceeded NAAQS for lead. 

The maximum lead concentration (0.207 μg/m3 on January 12, 2008) in Winkelman (Table 2) 

corresponded to the third highest arsenic concentration sample, is about 38% higher than 

the NAAQS of 0.15 μg/m3, and is about 4.7 times lower than the maximum lead value 

recorded in Hayden. However, the average lead concentration in Winkelman (0.0283 

μg/m3) is about 21 time higher than the Organ Pipe station average background value of 

0.00133 μg/m3. None of the three month rolling averages at the Winkelman station exceeded 

the NAAQS for lead. 

It is important to note that federal lead NAAQS is based on using a Total Suspended 

Particulate (TSP) monitor. Use of the PM10 sampler may show a lower observed value than 

measured by a TSP sampler. 

Copper Concentrations in Hayden and Winkelman. As shown in Figure 4, the concentration 

pattern for copper in the Hayden and Winkelman samples was very similar to arsenic and 

lead, with the elevated concentrations occurring on the same dates. There is no PRG or 

NAAQS for copper, and the California Acute REL is 100 μg/m3 (1 hour average). The 

maximum copper concentration (3.82 μg/m3 on September 30, 2008) in Hayden was well 

below the Acute REL. The average copper concentration in Hayden (0.502 μg/m3) is about 

353 times higher than the Organ Pipe station average background value of 0.00142 μg/m3. 
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The maximum copper concentration (1.39 μg/m3 on November 9, 2008) in Winkelman 

corresponded to the highest PM10 concentration dates. The maximum copper concentration 

in Winkelman is about three times lower than the maximum value recorded in Hayden. The 

average copper concentration at the Winkelman station (0.222 μg/m3) is about 156 times 

higher than the background average copper concentration (0.00142 μg/m3) at the Organ 

Pipe station. 

Chromium Concentrations in Hayden and Winkelman. As shown in Figure 5, the concentration 

pattern for chromium in the Hayden and Winkelman samples differs from arsenic, copper 

and lead, with the maximum concentrations occurring on the same dates as the maximum 

PM10 concentrations. 

The maximum chromium concentration in Hayden (0.01 μg/m3) is about 63 times the PRG 

of 0.00016 μg/m3. The average chromium concentration (0.00049 μg/m3) at the Organ Pipe 

background station is about three times the PRG. However, the average chromium 

concentration at the Hayden station (0.0013 μg/m3) is still about 3 times the Organ Pipe 

station average concentration of 0.00049 μg/m3. The highest chromium concentration in 

Winkelman (0.0042 μg/m3 on November 9, 2008) is about 26 times the PRG. The average 

chromium concentration at the Winkelman station (0.00066 μg/m3) is still about 1.3 times 

the Organ Pipe station average concentration of 0.00049 μg/m3. 

Arsenic to PM10 Concentration Ratio. Figure 6 shows the arsenic to PM10 concentration ratios 

at the two stations. A relatively high arsenic to PM10 ratio at the Hayden station occurred on 

March 6, 2008; April 12, 2008; May 16, 2008; August 5, 2008; and September 30, 2008. During 

the days of high arsenic to PM10 ratio coupled with high arsenic concentrations was 

measured predominantly when wind direction was from the smelter facility toward the 

Hayden station. No wind data was available for April 12, 2008. 

The higher arsenic to PM10 ratios at the Winkelman station occurred on the same days when 

elevated arsenic concentrations were found at the Winkelman station (January 12, 2008; 

August 8, 2008; and November 30, 2008). During these three days when high arsenic to 

PM10 ratio was measured at the Winkelman station, the predominant wind direction was 

from the smelter facility toward the Winkelman station. 

Cadmium Concentrations in Hayden and Winkelman. For Hayden samples, six cadmium 

results on May 16, 2008 (0.006 μg/m3), August 8, 2008 (0.0083 μg/m3), August 14, 2008 

(0.0033 μg/m3), September 30, 2008 (0.0203 μg/m3), November 21, 2008 (0.0346 μg/m3) and 

November 24, 2008 (0.0037 μg/m3) exceeded the PRG of 0.0011 μg/m3. The highest 

concentration for Hayden (the November 21, 2008 sample) is about 31 times the PRG. 

Cadmium was not found in the Organ Pipe station samples, with an MDL of 0.0006 μg/m3; 

however, the average cadmium concentration at the Hayden station (0.003 μg/m3) is about 5 

times the Organ Pipe station MDL value. 

For the Winkelman samples, none of the cadmium results were found to be above MDL for 

this monitoring period. 

Other Metals in Hayden and Winkelman 

As indicated in Tables 1 and 2, two exceedances of PRGs were identified for manganese. The 

manganese concentration in one Winkelman sample (November 9, 2008, 0.0524 μg/m3) 
ASARCO LLC HAYDEN PLANT SITE, ARIZONA 

PHX/\\MADISON\PROJ\USEPA\335404WA298ASARCO\GSA CONTRACT\DATA EVALUATION REPORT\FINAL REPORT\AIR DATA EVALUATION REPORT.DOC 6 

slightly exceeded the PRG of 0.051 μg/m3. The manganese exceedance corresponds with the 

sample date showing the highest PM10 concentration in Winkelman. 

The manganese concentration in one Hayden sample (November 9, 2008, 0.1113 μg/m3) also 

exceeded the PRG of 0.051 μg/m3. Similar to Winkelman, the manganese exceedance also 

corresponds with the sample date showing the highest PM10 concentration in Hayden. 

No other metals results display exceedances of regulatory criteria. However, as indicated on 

Tables 1 and 2, many metals do not have corresponding regulatory criteria that could be 

referenced in this report. Also, as described earlier in this TM, the three-sigma uncertainty 

value exceeded the regulatory criteria for some metals. 

Overall Data Results Comparison with Background 

As shown in Table 3, the average PM10 concentrations at Hayden and Winkelman stations 

were approximately 2.17 and 1.12 times higher, respectively, than average PM10 

concentrations at the Organ Pipe station. Arsenic and cadmium were not found above 

MDLs at the Organ Pipe station. However, the average concentrations of arsenic in Hayden 

and Winkelman were about 35-70 and 13-26 times the Organ Pipe station MDLs, and 

exceeded the PRG levels by a factor of 46 and 17, respectively. The average concentrations of 

cadmium in Hayden and Winkelman exceeded the PRG levels by a factor of 3 and 2, 

respectively. The average ambient air concentrations of copper, lead, and chromium at the 

Hayden station were 35, 76, and 3 times greater than average levels at the Organ Pipe 

station, respectively. Finally, the average ambient air concentration of copper, lead, and 

chromium at the Winkelman station were 156, 21, and 1.5 times higher, respectively, than 

average levels at the Organ Pipe station. 

Conclusions 

In summary, the concentrations of PM10 and metals in the Hayden and Winkelman stations 

exceed background levels. The PM10 concentrations in the Hayden station samples are about 

twice the levels in the Winkelman station samples. The concentrations of arsenic, cadmium, 

copper, chromium and lead are about 0.8 to 3.6 times higher in Hayden station samples 

compared to Winkelman station samples and both stations exhibit significantly higher 

concentrations compared to Organ Pipe (3 to 76 times) and the EPA PRGs (2 to 46 times). 

In general, the elevated PM10 values were found on the days with relative higher wind 

speeds; however, the highest values were not found on the days with highest wind speed. 

The highest PM10 concentration at both Hayden and Winkelman monitors occurred on 

November 9, 2008, when the wind directions were from the tailings impoundments and the 

track hopper, CF and Conveyor 9 area toward the monitoring stations. Because the wind 

was not blowing from the smelter facility (as it was on other days with elevated PM10 and 

metals concentrations), it is reasonable to assume that the major sources of the highest PM10

concentrations at the two stations were the fugitive dust emissions from the material 

handling activities and/or from the tailings impoundments and surrounding open spaces 

with exposed soils. However, lower PM10 concentrations were also found on other days 

when wind was blowing from the material handling facility and the tailing impoundments, 

but this may be attributed to lower wind speeds. 
ASARCO LLC HAYDEN PLANT SITE, ARIZONA 

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The PM10 concentrations observed at Hayden station were generally higher than at the 

Winkelman station, indicating that the top contributing sources are located closer to the 

Hayden station. However, an accurate determination of the major contributors to the PM10

concentrations is difficult without using additional analytical tools or specific source-area 

sampling instruments. 

The elevated PM10 emissions on November 9, 2008 did not coincide with elevated arsenic, 

lead, or cadmium concentrations monitored at the Hayden and Winkelman stations, 

indicating that the fugitive dust emissions from areas to the west and southwest of the 

monitoring stations were unlikely to be the top contributor for arsenic and lead. 

The arsenic and lead data generally show the same trend of concentration changes, and their 

concentrations were elevated on the same days when the smelter facilities were upwind of 

the monitors. In addition, arsenic to PM10 ratios were much higher on the days with 

elevated arsenic concentrations. The PM10 emissions from the smelter facility would likely 

contain higher arsenic content compared to the fugitive dust emissions from the material 

handling or tailings impoundment (wind erosion) areas. The higher arsenic to PM10 ratio 

indicates that the major sources for elevated arsenic and lead concentrations are likely the 

process generated emissions from the smelter facilities. 

The elevated copper concentrations generally occurred both on the days with elevated 

arsenic and lead concentrations. These results indicate that copper detected at the Hayden 

and Winkelman stations may be mostly attributed to the process generated emissions from 

the smelter facility. 

Highest chromium concentrations occurred on the days with highest PM10 concentrations at 

both monitors. However not all elevated chromium concentrations occurred on the days 

with elevated PM10. The chromium concentrations were not elevated on the days with 

elevated arsenic and lead concentrations. Therefore, an accurate determination of the major 

contributors to the chromium concentrations is difficult without using additional analytical 

tools or specific source-area sampling instruments. 

While overall there is consistency, a couple of significant differences during this period 

(November 13, 2007 through December 9, 2008) of monitoring as compared to the RI Report 

monitoring (October 2006 through October 2007) are as follows: 

• One measured PM10 concentration above the 24-hour average National Ambient Air 

Quality Standard on November 9, 2008 at Hayden Monitoring Station. This elevated 

PM10 concentration was measured while the wind was blowing from west (tailings piles) 

greater than 12 miles per hour speed towards the monitor. There were no PM10

concentrations above the 24-hour average National Ambient Air Quality Standard 

during the RI Report monitoring period. 

• Three measured lead concentrations above the revised EPA National Ambient Air 

Quality Standard for the rolling 3-month periods ending in September, October and 

November 2008 (note that data from the RI Report monitoring period were not 

compared against the new NAAQS value for lead). 
ASARCO LLC HAYDEN PLANT SITE, ARIZONA 

PHX/\\MADISON\PROJ\USEPA\335404WA298ASARCO\GSA CONTRACT\DATA EVALUATION REPORT\FINAL REPORT\AIR DATA EVALUATION REPORT.DOC 8 

Figures 
ASARCO, LLC Hayden Plant Site

Hayden, Arizona

FIGURE 1

PM10 CONCENTRATIONS AND WIND SPEED

FOR HAYDEN AND WINKELMAN MONITORS

Notes:

1

 PM10 = particulate matter with a diameter less than

 or equal to 10 microns in size

2

 μg/m3 = micrograms per cubic meter 3

 mile/hr = miles per hour

4

 Wind speeds for Hayden and Winkelman stations

 are very similar, to simplify the figure, only

 wind speeds at Hayden station are shown.

5

 Revised December 2008 The data on this figure are derived from tables 1 and 2.

 \\MADISON\GROUPS\EMS\GIS_LIBRARY\ASARCO\MAPFILES\04_DATAEVALUATIONREPORT\FIG1_GRAPH_PM10CONC&WINDSPEED_DEC07-08.MXD TJW 12/30/2008 14:02:59

0

20

40

60

80

100

120

140

160

180

11/13/0701/12/0803/06/0803/30/0804/15/0805/13/0805/31/0806/15/0806/30/0807/15/0807/30/0808/14/0809/01/0809/24/0810/16/0810/31/0811/15/0811/30/08

Date

PM10 Concentration (μg/m3

)

0

5

10

15

20

25

30

Wind Speed (mile/hr)

PM10 Hayden 10 PM10 Winkelman 10 Wind Speed
ASARCO, LLC Hayden Plant Site

Hayden, Arizona

FIGURE 2

ARSENIC CONCENTRATIONS IN AIR AT

HAYDEN AND WINKELMAN STATIONS

Notes:

1

 As = Arsenic

2

 μg/m3 = micrograms per cubic meter 3

 Revised December 2008

The data on this figure are derived from tables 1 and 2.

 \\MADISON\GROUPS\EMS\GIS_LIBRARY\ASARCO\MAPFILES\04_DATAEVALUATIONREPORT\FIG2_GRAPH_AIR_ARSENICCONC_DEC07-08.MXD TJW 12/30/2008 14:02:25

0.00

0.02

0.04

0.06

0.08

0.10

0.12

0.14

0.16

0.18

11/13/0701/12/0803/06/0803/30/0804/15/0805/13/0805/31/0806/15/0806/30/0807/15/0807/30/0808/14/0809/01/0809/24/0810/16/0810/31/0811/15/0811/30/08

Date

As Concentration (μg/m3

)

As Hayden As Winkelman
ASARCO, LLC Hayden Plant Site

Hayden, Arizona

FIGURE 3

LEAD CONCENTRATIONS IN AIR AT

HAYDEN AND WINKELMAN STATIONS

Notes:

1

 Pb = Lead

2

 μg/m3 = micrograms per cubic meter 3

 Revised December 2008

The data on this figure are derived from tables 1 and 2.

 \\MADISON\GROUPS\EMS\GIS_LIBRARY\ASARCO\MAPFILES\04_DATAEVALUATIONREPORT\FIG3_GRAPH_AIR_LEADCONC_DEC07-08.MXD TJW 12/30/2008 14:02:00

0.0

0.1

0.2

0.3

0.4

0.5

0.6

0.7

0.8

0.9

1.0

11/13/0701/12/0803/06/0803/30/0804/15/0805/13/0805/31/0806/15/0806/30/0807/15/0807/30/0808/14/0809/01/0809/24/0810/16/0810/31/0811/15/0811/30/08

Date

Pb Concentration (μg/m3

)

Pb Hayden Pb Winkelman
ASARCO, LLC Hayden Plant Site

Hayden, Arizona

FIGURE 4

COPPER CONCENTRATIONS IN AIR AT

HAYDEN AND WINKELMAN STATIONS

Notes:

1

 Cu = Copper

2

 μg/m3 = micrograms per cubic meter 3

 Revised December 2008

The data on this figure are derived from tables 1 and 2.

 \\MADISON\GROUPS\EMS\GIS_LIBRARY\ASARCO\MAPFILES\04_DATAEVALUATIONREPORT\FIG4_GRAPH_AIR_COPPERCONC_DEC07-08.MXD TJW 12/30/2008 14:02:43

0.0

0.5

1.0

1.5

2.0

2.5

3.0

3.5

4.0

11/13/0701/12/0803/06/0803/30/0804/15/0805/13/0805/31/0806/15/0806/30/0807/15/0807/30/0808/14/0809/01/0809/24/0810/16/0810/31/0811/15/0811/30/08

Date

Cu Concentration (μg/m3

)

Cu Hayden Cu Winkelman
ASARCO, LLC Hayden Plant Site

Hayden, Arizona

FIGURE 5

CHROMIUM CONCENTRATIONS IN AIR AT

HAYDEN AND WINKELMAN STATIONS

Notes:

1

 Cr = Chromium

2

 μg/m3 = micrograms per cubic meter 3

 Revised December 2008

The data on this figure are derived from tables 1 and 2.

 \\MADISON\GROUPS\EMS\GIS_LIBRARY\ASARCO\MAPFILES\04_DATAEVALUATIONREPORT\FIG5_GRAPH_AIR_CHROMIUMCONC_DEC07-08.MXD TJW 12/30/2008 14:02:13

0.000

0.002

0.004

0.006

0.008

0.010

0.012

11/13/0701/12/0803/06/0803/30/0804/15/0805/13/0805/31/0806/15/0806/30/0807/15/0807/30/0808/14/0809/01/0809/24/0810/16/0810/31/0811/15/0811/30/08

Date

Cr Concentration (μg/m3

)

Cr Hayden Cr Winkelman
ASARCO, LLC Hayden Plant Site

Hayden, Arizona

FIGURE 6

ARSENIC TO PM10 RATIOS IN AIR AT

HAYDEN AND WINKELMAN STATIONS

Notes:

1

 As = Arsenic

2

 P10 = particulate matter with a diameter less than

 or equal to 10 microns in size

3

 Revised December 2008

The data on this figure are derived from tables 1 and 2.

 \\MADISON\GROUPS\EMS\GIS_LIBRARY\ASARCO\MAPFILES\04_DATAEVALUATIONREPORT\FIG6_GRAPH_AIR_ARSENICTOPM10RATIO_DEC07-08.MXD TJW 12/30/2008 14:01:42

0.0000

0.0005

0.0010

0.0015

0.0020

0.0025

0.0030

0.0035

0.0040

11/13/0701/12/0803/06/0803/30/0804/15/0805/13/0805/31/0806/15/0806/30/0807/15/0807/30/0808/14/0809/01/0809/24/0810/16/0810/31/0811/15/0811/30/08

Date

As/PM10

As/PM10 Hayden 10 As/PM10 Winkelman 10
ASARCO LLC HAYDEN PLANT SITE, ARIZONA 

PHX/\\MADISON\PROJ\USEPA\335404WA298ASARCO\GSA CONTRACT\DATA EVALUATION REPORT\FINAL REPORT\AIR DATA EVALUATION REPORT.DOC 9 

Tables 
TABLE 1

Air Filter Sampling Laboratory Values for Inorganic ParametersHayden Monitoring StationData Evaluation ReportASARCO LLC Hayden, Arizona Plant Site

Parameter Units Result Percent12 Qual Result Percent12 Qual Result Percent12 

PM10 μg/m3 -- -- 150 7/50 8 -- 150 7 -- 53.97 NA 55.97 NA 28.99 NA 

Aluminum μg/m3 -- -- -- 5.1 -- -- 2.0490 4.0300 2.1430 4.0410 0.7519 2.6620 

Antimony μg/m3 13,000 1.46 -- -- -- -- 0.0081 0.0060 * 0.0093 0.0062 * 0.0087 0.0098 

Arsenic μg/m3 2,500 0.000441 -- 0.00045 -- 0.19 0.0021 0.0034 * 0.0069 0.0114 * 0.0200 0.0708 

Barium μg/m3 -- -- -- 0.52 -- -- 0.0195 0.0384 0.0222 0.0263 * 0.0105 0.0165 

Bismuth μg/m3 -- -- -- -- -- -- NA NA 0.0125 0.0235 0.0241 0.0852 

Bromine μg/m3 -- -- -- -- -- -- 0.0020 0.0039 0.0011 0.0020 0.0009 0.0025 Cadmium μg/m3 250 0.00105 -- 0.0011 -- -- 0.0057 0.0000 * 0.0075 0.0097 * 0.0069 0.0120 

Calcium μg/m3 -- -- -- -- -- -- 1.2470 2.4530 1.5930 3.0040 0.6822 2.4150 

Chlorine μg/m3 -- -- -- -- -- -- 0.0124 0.0244 0.0087 0.0000 * 0.0069 0.0000 

Chromium μg/m3 100 0.000158 -- 0.00016 -- -- 0.0017 0.0034 0.0027 0.0051 0.0012 0.0000 

Cobalt μg/m3 10,000 0.000686 -- 0.00069 -- -- 0.0216 0.0000 * 0.0351 0.0000 * 0.0153 0.0000 

Copper μg/m3 -- -- -- -- -- 100 0.1787 0.3516 0.4490 0.8465 0.4560 1.6140 

Gallium μg/m3 -- -- -- -- -- -- 0.0012 0.0000 * 0.0012 0.0000 * 0.0012 0.0000 

Germanium μg/m3 -- -- -- -- -- -- 0.0012 0.0000 * 0.0009 0.0000 * 0.0009 0.0000 Indium μg/m3 -- -- -- -- -- -- 0.0063 0.0000 * 0.0078 0.0000 * 0.0072 0.0153 Iron μg/m3 -- -- -- -- -- -- 1.1700 2.3010 1.9110 3.6020 0.8240 2.9170 

Lanthanum μg/m3 -- -- -- -- -- -- 0.0267 0.0000 * 0.0249 0.0013 * 0.0117 0.0000 

Lead μg/m3 -- -- 1.5 9 10 -- 1.5 9 10 -- 0.0049 0.0096 0.0420 0.0792 0.0538 0.1905 

Magnesium μg/m3 -- -- -- -- -- -- 0.2029 0.3992 0.3624 0.6833 0.1098 0.3887 

Manganese μg/m3 2,500 0.0521 -- 0.051 -- -- 0.0183 0.0360 0.0356 0.0671 0.0144 0.0508 

Mercury μg/m3 1,000 0.313 -- 0.31 -- 1.8 0.0024 0.0000 * 0.0018 0.0000 * 0.0018 0.0000 Molybdenum μg/m3 -- -- -- -- -- -- 0.0052 0.0102 0.0106 0.0201 0.0073 0.0260 

Nickel μg/m3 5,000 0.0079 -- 0.008 -- 6 0.0024 0.0014 * 0.0021 0.0039 0.0015 0.0047 

Palladium μg/m3 -- -- -- -- -- -- 0.0054 0.0000 * 0.0066 0.0028 * 0.006 0.0000 

Phosphorus μg/m3 -- -- -- -- -- -- 0.0063 0.0000 * 0.0075 0.0000 * 0.0048 0.0000 

Potassium μg/m3 -- -- -- -- -- -- 1.0520 2.0690 1.1940 2.2500 0.3390 1.2000 

Rubidium μg/m3 -- -- -- -- -- -- 0.0046 0.0091 0.0053 0.0100 0.0023 0.0080 Selenium μg/m3 500 18.3 -- -- -- -- 0.0009 0.0011 * 0.0015 0.0028 0.0154 0.0547 

Silicon μg/m3 -- -- -- -- -- -- 4.1660 8.1950 5.8520 11.0300 2.1540 7.6230 

Silver μg/m3 -- -- -- -- -- -- 0.0057 0.0000 * 0.0069 0.0012 * 0.0063 0.0005 

Sodium μg/m3 -- -- -- -- -- -- 0.1905 0.1638 * 0.2691 0.2497 * 0.1806 0.3752 

Strontium μg/m3 -- -- -- -- -- -- 0.0072 0.0141 0.0086 0.0162 0.0030 0.0107 Sulfur μg/m3 -- -- -- -- -- -- 0.7467 1.4690 0.9652 1.8200 0.6691 2.3680 Tin μg/m3 -- -- -- -- -- -- 0.0078 0.0059 * 0.0087 0.0020 * 0.0078 0.0000 

Titanium μg/m3 -- -- -- 31 -- -- 0.1313 0.2582 0.2292 0.4320 0.0971 0.3437 

Vanadium μg/m3 -- -- -- -- -- -- 0.0051 0.0000 * 0.0078 0.0026 * 0.0036 0.0003 

Yttrium μg/m3 -- -- -- -- -- -- 0.0019 0.0038 0.0013 0.0024 0.0012 0.0000 Zinc μg/m3 -- -- -- -- -- -- 0.0114 0.0225 0.0319 0.0601 0.0345 0.1220 

Zirconium μg/m3 -- -- -- -- -- -- 0.0042 0.0082 0.0050 0.0095 0.0016 0.0057 

Table Notes:

1 Arizona Department of Environmental Quality Acute and Chronic Ambient Air Concentrations, Title 18 Chapter 2 Article 17, December 2007 2 Arizona Department of Environmental Quality Ambient Air Quality Standards, Title 18 Chapter 2 Article 2, December 2007 Wind Speed: 3 EPA Region IX Preliminary Remediation Goals, Ambient Air, October 2004 mph 4 EPA National Ambient Air Quality Standards, http://www.epa.gov/air/criteria.html, February 2008 5 California Acute Reference Exposure Levels, March 1999 6 With the exception of arsenic, the averaging time for all listed analytes is one hour. The averaging time for arsenic is four hours7 The averaging time for the criteria is 24 hours.8 The averaging time for the criteria is the annual arithmetic mean. 9 The averaging time for the criteria is the quarterly average.10 Only the PM10 fraction is being measured not the total suspended particulates.11 Samples are anticipated to be rejected by EPA during validation.12 Percent of Total Mass13 Precipitation measurements are recorded manually by a Hayden-Winkelman High School employee; reliability cannot be verified Calm: < 114 Bold values with bold outline indicate the result exceeds one or more of the comparison criteria Wind direction15 Bold italicized values indicate the non-detected result exceeds one or more of the comparison criteria toward center Calm: 2.08% Calm: 4.17% Calm: 0.00% 16 * = The result is less than three times the level of uncertainty which is shown in place of the result.17 -- = Not established18 °C = Degrees Celsius19 % = Percent20 J = Estimated value21 mph = miles per hour22 NA = Not Applicable or Not Analyzed23 NPR = No precipitation recorded.24 NV = Not valid due to sample volume issues with the instrument.25 μg/m3 = Micrograms per cubic meter26 PM10 = particulate matter with a diameter less than or equal to 10 microns in size27 R = Rejected28 This table should be considered preliminary and will be revised based on incoming data, final data validation and QA/QC

NA NA NA 7.8 7.1 10.3 

20.9 18.7 11.1 

151 136 122 

3.85 3.54 4.78 

Date: 11/13/2007 11/19/2007 11/25/2007 

Arizona

Hazardous Air

Pollutants

Ambient Air

Concentrations

(Acute)

1

Arizona

Hazardous Air

Pollutants

Ambient Air

Concentrations

(Chronic)

1

EPA

Region IX

Preliminary

Remediation

Goal3

Avg Wind Speed mph):

Avg Ambient Relative Humidity (%):

Avg Wind Direction (degrees):

Avg Ambient Temperature (oC): Arizona

Ambient

Air Quality

Standards2

Precipitation (inches)7

:

California

Acute

Reference

Exposure

Levels5 6

EPA

National

Ambient

Air Quality

Standards4
TABLE 1

Air Filter Sampling Laboratory Values for Inorganic ParametersHayden Monitoring StationData Evaluation ReportASARCO LLC Hayden, Arizona Plant Site

Parameter Units

PM10 μg/m3 -- -- 150 7/50 8 -- 150 7 --

Aluminum μg/m3 -- -- -- 5.1 -- --

Antimony μg/m3 13,000 1.46 -- -- -- --

Arsenic μg/m3 2,500 0.000441 -- 0.00045 -- 0.19

Barium μg/m3 -- -- -- 0.52 -- --

Bismuth μg/m3 -- -- -- -- -- --Bromine μg/m3 -- -- -- -- -- --Cadmium μg/m3 250 0.00105 -- 0.0011 -- --

Calcium μg/m3 -- -- -- -- -- --

Chlorine μg/m3 -- -- -- -- -- --Chromium μg/m3 100 0.000158 -- 0.00016 -- --

Cobalt μg/m3 10,000 0.000686 -- 0.00069 -- --

Copper μg/m3 -- -- -- -- -- 100

Gallium μg/m3 -- -- -- -- -- --

Germanium μg/m3 -- -- -- -- -- --Indium μg/m3 -- -- -- -- -- --Iron μg/m3 -- -- -- -- -- --Lanthanum μg/m3 -- -- -- -- -- --Lead μg/m3 -- -- 1.5 9 10 -- 1.5 9 10 --

Magnesium μg/m3 -- -- -- -- -- --

Manganese μg/m3 2,500 0.0521 -- 0.051 -- --

Mercury μg/m3 1,000 0.313 -- 0.31 -- 1.8

Molybdenum μg/m3 -- -- -- -- -- --

Nickel μg/m3 5,000 0.0079 -- 0.008 -- 6

Palladium μg/m3 -- -- -- -- -- --

Phosphorus μg/m3 -- -- -- -- -- --Potassium μg/m3 -- -- -- -- -- --Rubidium μg/m3 -- -- -- -- -- --Selenium μg/m3 500 18.3 -- -- -- --

Silicon μg/m3 -- -- -- -- -- --

Silver μg/m3 -- -- -- -- -- --Sodium μg/m3 -- -- -- -- -- --Strontium μg/m3 -- -- -- -- -- --Sulfur μg/m3 -- -- -- -- -- --Tin μg/m3 -- -- -- -- -- --Titanium μg/m3 -- -- -- 31 -- --Vanadium μg/m3 -- -- -- -- -- --Yttrium μg/m3 -- -- -- -- -- --Zinc μg/m3 -- -- -- -- -- --Zirconium μg/m3 -- -- -- -- -- --

Table Notes:

1 Arizona Department of Environmental Quality Acute and Chronic Ambient Air Concentrations, Title 18 Chapter 2 Article 17, December 2007 2 Arizona Department of Environmental Quality Ambient Air Quality Standards, Title 18 Chapter 2 Article 2, December 2007 Wind Speed: 3 EPA Region IX Preliminary Remediation Goals, Ambient Air, October 2004 mph 4 EPA National Ambient Air Quality Standards, http://www.epa.gov/air/criteria.html, February 2008 5 California Acute Reference Exposure Levels, March 1999 6 With the exception of arsenic, the averaging time for all listed analytes is one hour. The averaging time for arsenic is four hours7 The averaging time for the criteria is 24 hours.8 The averaging time for the criteria is the annual arithmetic mean. 9 The averaging time for the criteria is the quarterly average.10 Only the PM10 fraction is being measured not the total suspended particulates.11 Samples are anticipated to be rejected by EPA during validation.12 Percent of Total Mass13 Precipitation measurements are recorded manually by a Hayden-Winkelman High School employee; reliability cannot be verified Calm: < 114 Bold values with bold outline indicate the result exceeds one or more of the comparison criteria Wind direction15 Bold italicized values indicate the non-detected result exceeds one or more of the comparison criteria toward center16 * = The result is less than three times the level of uncertainty which is shown in place of the result.17 -- = Not established18 °C = Degrees Celsius19 % = Percent20 J = Estimated value21 mph = miles per hour22 NA = Not Applicable or Not Analyzed23 NPR = No precipitation recorded.24 NV = Not valid due to sample volume issues with the instrument.25 μg/m3 = Micrograms per cubic meter26 PM10 = particulate matter with a diameter less than or equal to 10 microns in size27 R = Rejected28 This table should be considered preliminary and will be revised based on incoming data, final data validation and QA/QC

Date:

Arizona

Hazardous Air

Pollutants

Ambient Air

Concentrations

(Acute)

1

Arizona

Hazardous Air

Pollutants

Ambient Air

Concentrations

(Chronic)

1

EPA

Region IX

Preliminary

Remediation

Goal3

Avg Wind Speed mph):

Avg Ambient Relative Humidity (%):

Avg Wind Direction (degrees):

Avg Ambient Temperature (oC): Arizona

Ambient

Air Quality

Standards2

Precipitation (inches)7

:

California

Acute

Reference

Exposure

Levels5 6

EPA

National

Ambient

Air Quality

Standards4 Result Percent12 Qual Result Percent12 Qual Result Percent12 

18.26 NA 11.11 NA 8.32 NA 

0.6403 3.533 0.2615 2.395 0.1888 2.3480 

0.009 0.0031 * 0.0084 0 * 0.0024 0.0000 

0.0153 0.0844 0.0063 0.0574 0.0033 0.0416 

0.0063 0 * 0.0048 0.003 * 0.0045 0.0059 0.0153 0.0842 NA NA NA NA 

0.0009 0.0018 * 0.0019 0.0173 0.0010 0.0129 

0.0072 0.0094 * 0.0066 0.0358 * 0.0018 0.0000 

0.4329 2.389 0.2391 2.191 0.2096 2.6060 

0.0072 0.0255 * 0.006 0.0147 * 0.2038 2.5340 0.0023 0.0125 0.0012 0 * 0.0009 0.0000 

0.012 0 * 0.0057 0 * 0.0039 0.0000 

0.3645 2.011 0.0846 0.775 0.0311 0.3870 0.0015 0 * 0.0012 0 * 0.0012 0.0000 

0.0009 0 * 0.0009 0 * 0.0009 0.0029 0.0075 0 * 0.0072 0 * 0.0021 0.0035 0.6352 3.504 0.2685 2.46 0.1528 1.9000 

0.0069 0 * 0.0051 0.0142 * 0.0069 0.0000 0.0613 0.3385 0.0291 0.2665 0.0081 0.1013 

0.051 0.2509 * 0.0405 0.3554 * 0.0613 0.7617 

0.0059 0.0325 0.0038 0.0349 0.0025 0.0316 0.0018 0 * 0.0018 0 * 0.0024 0.0064 

0.0062 0.0343 0.0021 0.0091 * 0.0027 0.0000 

0.0018 0 * 0.0015 0.0108 * 0.0021 0.0023 0.0063 0.0013 * 0.006 0 * 0.0018 0.0000 0.0042 0 * 0.0039 0 * 0.0033 0.0000 

0.3384 1.867 0.1419 1.3 0.0928 1.1530 

0.0014 0.0075 0.0006 0.0026 * 0.0009 0.0000 0.0051 0.0283 0.0046 0.0418 0.0017 0.0211 1.6950 9.352 0.7218 6.612 0.4939 6.1420 0.0066 0 * 0.0063 0.0121 * 0.0018 0.0082 0.1689 0.6741 * 0.138 0.9096 * 0.2191 2.7240 0.0023 0.0125 0.0020 0.0181 0.0012 0.0070 0.4953 2.733 0.5010 4.589 0.1709 2.1250 0.0081 0.0153 * 0.0078 0 * 0.0027 0.0000 0.0396 0.2187 0.0267 0.2445 0.0149 0.1856 0.0018 0 * 0.0012 0 * 0.0009 0.0000 

0.0012 0 * 0.0012 0 * 0.0015 0.0000 0.0422 0.233 0.0209 0.1915 0.0086 0.1071 

0.0015 0.0016 * 0.0012 0.0004 * 0.0021 0.0094 

Calm: 0.00% Calm: 31.25% Calm: 0.00% 

17.0

NA

02/23/08 

13.9 

4.23 

NA NA

10.6 31.7

6.3 8.8

104 259

3.73 2.67

1/18/2008 2/17/2008

272
TABLE 1

Air Filter Sampling Laboratory Values for Inorganic ParametersHayden Monitoring StationData Evaluation ReportASARCO LLC Hayden, Arizona Plant Site

Parameter Units

PM10 μg/m3 -- -- 150 7/50 8 -- 150 7 --

Aluminum μg/m3 -- -- -- 5.1 -- --

Antimony μg/m3 13,000 1.46 -- -- -- --

Arsenic μg/m3 2,500 0.000441 -- 0.00045 -- 0.19

Barium μg/m3 -- -- -- 0.52 -- --

Bismuth μg/m3 -- -- -- -- -- --Bromine μg/m3 -- -- -- -- -- --Cadmium μg/m3 250 0.00105 -- 0.0011 -- --

Calcium μg/m3 -- -- -- -- -- --

Chlorine μg/m3 -- -- -- -- -- --Chromium μg/m3 100 0.000158 -- 0.00016 -- --

Cobalt μg/m3 10,000 0.000686 -- 0.00069 -- --

Copper μg/m3 -- -- -- -- -- 100

Gallium μg/m3 -- -- -- -- -- --

Germanium μg/m3 -- -- -- -- -- --Indium μg/m3 -- -- -- -- -- --Iron μg/m3 -- -- -- -- -- --Lanthanum μg/m3 -- -- -- -- -- --Lead μg/m3 -- -- 1.5 9 10 -- 1.5 9 10 --

Magnesium μg/m3 -- -- -- -- -- --

Manganese μg/m3 2,500 0.0521 -- 0.051 -- --

Mercury μg/m3 1,000 0.313 -- 0.31 -- 1.8

Molybdenum μg/m3 -- -- -- -- -- --

Nickel μg/m3 5,000 0.0079 -- 0.008 -- 6

Palladium μg/m3 -- -- -- -- -- --

Phosphorus μg/m3 -- -- -- -- -- --Potassium μg/m3 -- -- -- -- -- --Rubidium μg/m3 -- -- -- -- -- --Selenium μg/m3 500 18.3 -- -- -- --

Silicon μg/m3 -- -- -- -- -- --

Silver μg/m3 -- -- -- -- -- --Sodium μg/m3 -- -- -- -- -- --Strontium μg/m3 -- -- -- -- -- --Sulfur μg/m3 -- -- -- -- -- --Tin μg/m3 -- -- -- -- -- --Titanium μg/m3 -- -- -- 31 -- --Vanadium μg/m3 -- -- -- -- -- --Yttrium μg/m3 -- -- -- -- -- --Zinc μg/m3 -- -- -- -- -- --Zirconium μg/m3 -- -- -- -- -- --

Table Notes:

1 Arizona Department of Environmental Quality Acute and Chronic Ambient Air Concentrations, Title 18 Chapter 2 Article 17, December 2007 2 Arizona Department of Environmental Quality Ambient Air Quality Standards, Title 18 Chapter 2 Article 2, December 2007 Wind Speed: 3 EPA Region IX Preliminary Remediation Goals, Ambient Air, October 2004 mph 4 EPA National Ambient Air Quality Standards, http://www.epa.gov/air/criteria.html, February 2008 5 California Acute Reference Exposure Levels, March 1999 6 With the exception of arsenic, the averaging time for all listed analytes is one hour. The averaging time for arsenic is four hours7 The averaging time for the criteria is 24 hours.8 The averaging time for the criteria is the annual arithmetic mean. 9 The averaging time for the criteria is the quarterly average.10 Only the PM10 fraction is being measured not the total suspended particulates.11 Samples are anticipated to be rejected by EPA during validation.12 Percent of Total Mass13 Precipitation measurements are recorded manually by a Hayden-Winkelman High School employee; reliability cannot be verified Calm: < 114 Bold values with bold outline indicate the result exceeds one or more of the comparison criteria Wind direction15 Bold italicized values indicate the non-detected result exceeds one or more of the comparison criteria toward center16 * = The result is less than three times the level of uncertainty which is shown in place of the result.17 -- = Not established18 °C = Degrees Celsius19 % = Percent20 J = Estimated value21 mph = miles per hour22 NA = Not Applicable or Not Analyzed23 NPR = No precipitation recorded.24 NV = Not valid due to sample volume issues with the instrument.25 μg/m3 = Micrograms per cubic meter26 PM10 = particulate matter with a diameter less than or equal to 10 microns in size27 R = Rejected28 This table should be considered preliminary and will be revised based on incoming data, final data validation and QA/QC

Date:

Arizona

Hazardous Air

Pollutants

Ambient Air

Concentrations

(Acute)

1

Arizona

Hazardous Air

Pollutants

Ambient Air

Concentrations

(Chronic)

1

EPA

Region IX

Preliminary

Remediation

Goal3

Avg Wind Speed mph):

Avg Ambient Relative Humidity (%):

Avg Wind Direction (degrees):

Avg Ambient Temperature (oC): Arizona

Ambient

Air Quality

Standards2

Precipitation (inches)7

:

California

Acute

Reference

Exposure

Levels5 6

EPA

National

Ambient

Air Quality

Standards4 Result Percent12 Qual Result Percent12 Qual Result Percent12 

NV NV 29.53 NA 28.67 NA 

NV NV 1.1140 3.9510 0.7213 2.6590 NV NV 0.0027 0.0022 * 0.0027 0.0045 NV NV 0.0039 0.0139 0.0027 0.0078 

NV NV 0.0102 0.0159 * 0.0078 0.0036 NV NV NA NA NA NA NV NV 0.0031 0.0108 0.0056 0.0208 NV NV 0.0021 0.0012 * 0.0018 0.0000 NV NV 1.1700 4.1490 0.8178 3.0150 NV NV 0.0309 0.1097 0.0790 0.2913 NV NV 0.0012 0.0022 * 0.0017 0.0064 

NV NV 0.0156 0.0000 * 0.0126 0.0000 NV NV 0.2691 0.9541 0.2024 0.7460 NV NV 0.0012 0.0000 * 0.0012 0.0000 NV NV 0.0012 0.0000 * 0.0009 0.0000 NV NV 0.0021 0.0000 * 0.0021 0.0000 NV NV 0.8418 2.9840 0.6822 2.5150 NV NV 0.0171 0.0057 * 0.0132 0.0134 NV NV 0.0152 0.0539 0.0125 0.0460 NV NV 0.3135 1.1110 0.2193 0.8084 NV NV 0.0134 0.0474 0.0103 0.0380 NV NV 0.0024 0.0000 * 0.0021 0.0000 NV NV 0.0049 0.0174 0.0032 0.0120 NV NV 0.0024 0.0007 * 0.0021 0.0000 NV NV 0.0018 0.0000 * 0.0018 0.0000 NV NV 0.0057 0.0000 * 0.0048 0.0000 NV NV 0.4226 1.4980 0.2662 0.9812 NV NV 0.0020 0.0072 0.0012 0.0028 

NV NV 0.0009 0.0008 * 0.0009 0.0000 NV NV 3.4400 12.1900 1.9060 7.0280 

NV NV 0.0021 0.0025 * 0.0018 0.0000 NV NV 0.1641 0.3443 * 0.1500 0.4034 NV NV 0.0050 0.0177 0.0041 0.0153 NV NV 0.6884 2.4400 0.5090 1.8760 NV NV 0.0027 0.0000 * 0.0030 0.0062 NV NV 0.0787 0.2789 0.0547 0.2015 NV NV 0.0030 0.0015 * 0.0024 0.0010 NV NV 0.0015 0.0000 * 0.0015 0.0000 NV NV 0.0147 0.0522 0.0144 0.0529 NV NV 0.0021 0.0072 * 0.0018 0.0012 

Calm: 8.33% Calm: 25.00% Calm: 31.25% 

03/26/08

3.11

NA

7.6NA

6.9NA

03/20/08

256

19.2

NV

03/14/08

NVNVNV

203

16.4

3.73
TABLE 1

Air Filter Sampling Laboratory Values for Inorganic ParametersHayden Monitoring StationData Evaluation ReportASARCO LLC Hayden, Arizona Plant Site

Parameter Units Result Percent12 Qual Result Percent12 Qual Result Percent12 

PM10 μg/m3 -- -- 150 7/50 8 -- 150 7 -- 29.12 NA 33.35 NA 44.78 NA 

Aluminum μg/m3 -- -- -- 5.1 -- -- 0.8357 3.0440 1.037 3.3550 1.649 3.8990 

Antimony μg/m3 13,000 1.46 -- -- -- -- 0.0055 0.0199 0.0027 0.0020 * 0.003 0.0050 

Arsenic μg/m3 2,500 0.000441 -- 0.00045 -- 0.19 0.0970 0.3532 0.0120 0.0388 0.0227 0.0538 

Barium μg/m3 -- -- -- 0.52 -- -- 0.0489 0.1782 0.0126 0.0201 * 0.0165 0.0257 

Bismuth μg/m3 -- -- -- -- -- -- 0.0898 0.3272 0.0101 0.0326 0.0308 0.0728 Bromine μg/m3 -- -- -- -- -- -- 0.003 0.0000 * 0.0023 0.0073 0.005 0.0119 

Cadmium μg/m3 250 0.00105 -- 0.0011 -- -- 0.0052 0.0189 0.0018 0.0008 * 0.0021 0.0023 

Calcium μg/m3 -- -- -- -- -- -- 0.8051 2.9320 0.8023 2.5950 1.329 3.1420 

Chlorine μg/m3 -- -- -- -- -- -- 0.0159 0.0099 * 0.0436 0.1412 0.0497 0.1176 

Chromium μg/m3 100 0.000158 -- 0.00016 -- -- 0.0071 0.0259 0.0009 0.0000 * 0.0015 0.0022 

Cobalt μg/m3 10,000 0.000686 -- 0.00069 -- -- 0.0201 0.0000 * 0.0117 0.0000 * 0.0162 0.0000 

Copper μg/m3 -- -- -- -- -- 100 2.055 7.4830 0.2266 0.7330 0.3633 0.8591 

Gallium μg/m3 -- -- -- -- -- -- 0.0048 0.0000 * 0.0015 0.0000 * 0.0021 0.0000 

Germanium μg/m3 -- -- -- -- -- -- 0.0015 0.0000 * 0.0012 0.0000 * 0.0012 0.0000 Indium μg/m3 -- -- -- -- -- -- 0.0021 0.0033 * 0.0018 0.0000 * 0.0021 0.0011 Iron μg/m3 -- -- -- -- -- -- 1.738 6.3310 0.9205 2.9770 1.281 3.0290 

Lanthanum μg/m3 -- -- -- -- -- -- 0.0096 0.0000 * 0.0108 0.0000 * 0.0138 0.0000 

Lead μg/m3 -- -- 1.5 9 10 -- 1.5 9 10 -- 0.4627 1.6850 0.059 0.1908 0.1272 0.3007 

Magnesium μg/m3 -- -- -- -- -- -- 0.0477 0.0899 * 0.2325 0.7522 0.3601 0.8515 

Manganese μg/m3 2,500 0.0521 -- 0.051 -- -- 0.0125 0.0456 0.0147 0.0477 0.0244 0.0578 

Mercury μg/m3 1,000 0.313 -- 0.31 -- 1.8 0.0024 0.0000 * 0.0024 0.0000 * 0.0024 0.0000 Molybdenum μg/m3 -- -- -- -- -- -- 0.0373 0.1358 0.003 0.0049 * 0.0081 0.0193 

Nickel μg/m3 5,000 0.0079 -- 0.008 -- 6 0.0027 0.0000 * 0.0024 0.0043 * 0.0024 0.0010 

Palladium μg/m3 -- -- -- -- -- -- 0.0021 0.0000 * 0.0021 0.0000 * 0.0021 0.0000 

Phosphorus μg/m3 -- -- -- -- -- -- 0.0054 0.0009 * 0.0048 0.0008 * 0.012 0.0073 Potassium μg/m3 -- -- -- -- -- -- 0.3486 1.2690 0.3535 1.1430 0.6262 1.4810 Rubidium μg/m3 -- -- -- -- -- -- 0.0032 0.0115 0.0015 0.0049 0.0027 0.0063 

Selenium μg/m3 500 18.3 -- -- -- -- 0.0604 0.2198 0.0028 0.0091 0.0074 0.0175 

Silicon μg/m3 -- -- -- -- -- -- 2.177 7.9270 2.826 9.1410 4.233 10.0100 

Silver μg/m3 -- -- -- -- -- -- 0.0075 0.0274 0.0021 0.0003 * 0.0021 0.0011 Sodium μg/m3 -- -- -- -- -- -- 0.0843 0.0000 * 0.1926 0.2584 * 0.4872 0.5309 Strontium μg/m3 -- -- -- -- -- -- 0.0041 0.0149 0.0064 0.0206 0.0095 0.0225 

Sulfur μg/m3 -- -- -- -- -- -- 1.706 6.2140 0.6756 2.1850 1.465 3.4650 

Tin μg/m3 -- -- -- -- -- -- 0.003 0.0093 * 0.0024 0.0011 * 0.0024 0.0000 Titanium μg/m3 -- -- -- 31 -- -- 0.0885 0.3222 0.1114 0.3602 0.1333 0.3152 

Vanadium μg/m3 -- -- -- -- -- -- 0.0033 0.0070 * 0.0042 0.0119 * 0.0051 0.0107 Yttrium μg/m3 -- -- -- -- -- -- 0.0042 0.0000 * 0.0027 0.0000 * 0.003 0.0000 Zinc μg/m3 -- -- -- -- -- -- 0.2285 0.8322 0.0267 0.0863 0.0603 0.1425 Zirconium μg/m3 -- -- -- -- -- -- 0.0045 0.0163 0.0043 0.0139 0.0025 0.0059 

Table Notes:

1 Arizona Department of Environmental Quality Acute and Chronic Ambient Air Concentrations, Title 18 Chapter 2 Article 17, December 2007 2 Arizona Department of Environmental Quality Ambient Air Quality Standards, Title 18 Chapter 2 Article 2, December 2007 Wind Speed: 3 EPA Region IX Preliminary Remediation Goals, Ambient Air, October 2004 mph 4 EPA National Ambient Air Quality Standards, http://www.epa.gov/air/criteria.html, February 2008 5 California Acute Reference Exposure Levels, March 1999 6 With the exception of arsenic, the averaging time for all listed analytes is one hour. The averaging time for arsenic is four hours7 The averaging time for the criteria is 24 hours.8 The averaging time for the criteria is the annual arithmetic mean. 9 The averaging time for the criteria is the quarterly average.10 Only the PM10 fraction is being measured not the total suspended particulates.11 Samples are anticipated to be rejected by EPA during validation.12 Percent of Total Mass13 Precipitation measurements are recorded manually by a Hayden-Winkelman High School employee; reliability cannot be verified Calm: < 114 Bold values with bold outline indicate the result exceeds one or more of the comparison criteria Wind direction15 Bold italicized values indicate the non-detected result exceeds one or more of the comparison criteria toward center Calm: 2.08% 16 * = The result is less than three times the level of uncertainty which is shown in place of the result.17 -- = Not established18 °C = Degrees Celsius19 % = Percent20 J = Estimated value21 mph = miles per hour22 NA = Not Applicable or Not Analyzed23 NPR = No precipitation recorded.24 NV = Not valid due to sample volume issues with the instrument.25 μg/m3 = Micrograms per cubic meter26 PM10 = particulate matter with a diameter less than or equal to 10 microns in size27 R = Rejected28 This table should be considered preliminary and will be revised based on incoming data, final data validation and QA/QC

California

Acute

Reference

Exposure

Levels5 6

EPA

National

Ambient

Air Quality

Standards4

EPA

Region IX

Preliminary

Remediation

Goal3

Avg Wind Speed mph):

Avg Ambient Relative Humidity (%):

Avg Wind Direction (degrees):

Avg Ambient Temperature (oC): Arizona

Ambient

Air Quality

Standards2

Precipitation (inches)7

:

Date:

Arizona

Hazardous Air

Pollutants

Ambient Air

Concentrations

(Acute)

1

Arizona

Hazardous Air

Pollutants

Ambient Air

Concentrations

(Chronic)

1

236

23.5

6.6NA

04/12/08

7.95

44

21.4

6.4NA

04/18/08

4.41

138

19.3

6.9NA

04/15/08

5.53
TABLE 1

Air Filter Sampling Laboratory Values for Inorganic ParametersHayden Monitoring StationData Evaluation ReportASARCO LLC Hayden, Arizona Plant Site

Parameter Units

PM10 μg/m3 -- -- 150 7/50 8 -- 150 7 --

Aluminum μg/m3 -- -- -- 5.1 -- --

Antimony μg/m3 13,000 1.46 -- -- -- --

Arsenic μg/m3 2,500 0.000441 -- 0.00045 -- 0.19

Barium μg/m3 -- -- -- 0.52 -- --

Bismuth μg/m3 -- -- -- -- -- --Bromine μg/m3 -- -- -- -- -- --Cadmium μg/m3 250 0.00105 -- 0.0011 -- --

Calcium μg/m3 -- -- -- -- -- --

Chlorine μg/m3 -- -- -- -- -- --Chromium μg/m3 100 0.000158 -- 0.00016 -- --

Cobalt μg/m3 10,000 0.000686 -- 0.00069 -- --

Copper μg/m3 -- -- -- -- -- 100

Gallium μg/m3 -- -- -- -- -- --

Germanium μg/m3 -- -- -- -- -- --Indium μg/m3 -- -- -- -- -- --Iron μg/m3 -- -- -- -- -- --Lanthanum μg/m3 -- -- -- -- -- --Lead μg/m3 -- -- 1.5 9 10 -- 1.5 9 10 --

Magnesium μg/m3 -- -- -- -- -- --

Manganese μg/m3 2,500 0.0521 -- 0.051 -- --

Mercury μg/m3 1,000 0.313 -- 0.31 -- 1.8

Molybdenum μg/m3 -- -- -- -- -- --

Nickel μg/m3 5,000 0.0079 -- 0.008 -- 6

Palladium μg/m3 -- -- -- -- -- --

Phosphorus μg/m3 -- -- -- -- -- --Potassium μg/m3 -- -- -- -- -- --Rubidium μg/m3 -- -- -- -- -- --Selenium μg/m3 500 18.3 -- -- -- --

Silicon μg/m3 -- -- -- -- -- --

Silver μg/m3 -- -- -- -- -- --Sodium μg/m3 -- -- -- -- -- --Strontium μg/m3 -- -- -- -- -- --Sulfur μg/m3 -- -- -- -- -- --Tin μg/m3 -- -- -- -- -- --Titanium μg/m3 -- -- -- 31 -- --Vanadium μg/m3 -- -- -- -- -- --Yttrium μg/m3 -- -- -- -- -- --Zinc μg/m3 -- -- -- -- -- --Zirconium μg/m3 -- -- -- -- -- --

Table Notes:

1 Arizona Department of Environmental Quality Acute and Chronic Ambient Air Concentrations, Title 18 Chapter 2 Article 17, December 2007 2 Arizona Department of Environmental Quality Ambient Air Quality Standards, Title 18 Chapter 2 Article 2, December 2007 Wind Speed: 3 EPA Region IX Preliminary Remediation Goals, Ambient Air, October 2004 mph 4 EPA National Ambient Air Quality Standards, http://www.epa.gov/air/criteria.html, February 2008 5 California Acute Reference Exposure Levels, March 1999 6 With the exception of arsenic, the averaging time for all listed analytes is one hour. The averaging time for arsenic is four hours7 The averaging time for the criteria is 24 hours.8 The averaging time for the criteria is the annual arithmetic mean. 9 The averaging time for the criteria is the quarterly average.10 Only the PM10 fraction is being measured not the total suspended particulates.11 Samples are anticipated to be rejected by EPA during validation.12 Percent of Total Mass13 Precipitation measurements are recorded manually by a Hayden-Winkelman High School employee; reliability cannot be verified Calm: < 114 Bold values with bold outline indicate the result exceeds one or more of the comparison criteria Wind direction15 Bold italicized values indicate the non-detected result exceeds one or more of the comparison criteria toward center16 * = The result is less than three times the level of uncertainty which is shown in place of the result.17 -- = Not established18 °C = Degrees Celsius19 % = Percent20 J = Estimated value21 mph = miles per hour22 NA = Not Applicable or Not Analyzed23 NPR = No precipitation recorded.24 NV = Not valid due to sample volume issues with the instrument.25 μg/m3 = Micrograms per cubic meter26 PM10 = particulate matter with a diameter less than or equal to 10 microns in size27 R = Rejected28 This table should be considered preliminary and will be revised based on incoming data, final data validation and QA/QC

California

Acute

Reference

Exposure

Levels5 6

EPA

National

Ambient

Air Quality

Standards4

EPA

Region IX

Preliminary

Remediation

Goal3

Avg Wind Speed mph):

Avg Ambient Relative Humidity (%):

Avg Wind Direction (degrees):

Avg Ambient Temperature (oC): Arizona

Ambient

Air Quality

Standards2

Precipitation (inches)7

:

Date:

Arizona

Hazardous Air

Pollutants

Ambient Air

Concentrations

(Acute)

1

Arizona

Hazardous Air

Pollutants

Ambient Air

Concentrations

(Chronic)

1 Result Percent12 Qual Result Percent12 Qual Result Percent12 

40.06 NA 23.85 NA 32.67 NA 

1.389 3.6830 0.3975 1.7930 1.132 3.8310 

0.0027 0.0024 * 0.0037 0.0168 0.0024 0.0000 0.0426 0.1130 0.0830 0.3745 0.0042 0.0110 

0.0144 0.0330 * 0.0181 0.0816 0.0117 0.0193 0.0263 0.0697 0.083 0.3745 0.0073 0.0247 

0.0012 0.0021 * 0.0021 0.0000 * 0.0041 0.0139 0.0021 0.0015 * 0.0060 0.0270 0.0018 0.0000 

1.09 2.8910 0.3476 1.5680 0.9939 3.3640 

0.2183 0.5790 0.0105 0.0000 * 0.0197 0.0666 

0.0012 0.0027 * 0.0009 0.0040 0.0009 0.0033 

0.0192 0.0000 * 0.0102 0.0000 * 0.0129 0.0000 0.6582 1.7460 1.39 6.2700 0.1416 0.4793 0.0021 0.0000 * 0.0033 0.0000 * 0.0012 0.0000 

0.0012 0.0000 * 0.0012 0.0000 * 0.0012 0.0000 

0.0021 0.0000 * 0.0018 0.0042 * 0.0018 0.0010 

1.55 4.1100 0.7999 3.6090 1.036 3.5080 

0.012 0.0000 * 0.006 0.0000 * 0.0102 0.0000 

0.1163 0.3084 0.288 1.2990 0.0236 0.0798 0.3979 1.0550 0.081 0.2434 * 0.4217 1.4280 

0.021 0.0557 0.0053 0.0240 0.0153 0.0520 

0.0024 0.0000 * 0.0021 0.0000 * 0.0021 0.0000 

0.0097 0.0257 0.0172 0.0777 0.0027 0.0041 0.0024 0.0042 * 0.0024 0.0000 * 0.0021 0.0019 

0.0021 0.0000 * 0.0018 0.0000 * 0.0018 0.0000 

0.006 0.0136 * 0.0045 0.0000 * 0.0101 0.0343 

0.6347 1.6830 0.1913 0.8632 0.442 1.4960 0.0035 0.0094 0.0029 0.0130 0.0024 0.0080 0.0237 0.0628 0.0308 0.1389 0.0012 0.0041 

3.23 8.5660 1.022 4.6110 2.657 8.9950 

0.0021 0.0055 * 0.0027 0.0123 0.0018 0.0000 0.2867 0.7603 0.072 0.0000 * 0.1842 0.3019 0.0085 0.0225 0.0024 0.0110 0.0066 0.0225 

1.359 3.6050 1.195 5.3910 0.7562 2.5600 

0.0027 0.0022 * 0.0027 0.0110 * 0.0024 0.0000 

0.1251 0.3319 0.0462 0.2084 0.1052 0.3561 0.0045 0.0097 * 0.0018 0.0034 * 0.0039 0.0107 

0.003 0.0000 * 0.003 0.0017 * 0.0024 0.0000 

0.0857 0.2274 0.219 0.9879 0.0174 0.0588 

0.0022 0.0059 0.0028 0.0127 0.0023 0.0077 

Calm: 6.25% Calm: 0.00% Calm: 16.00%

5.5NA

05/16/08

8.57

05/19/08

5.72

260

31.0

52

24.9

15.8

NA

6.7NA

05/13/08

5.03

304

18.6
TABLE 1

Air Filter Sampling Laboratory Values for Inorganic ParametersHayden Monitoring StationData Evaluation ReportASARCO LLC Hayden, Arizona Plant Site

Parameter Units

PM10 μg/m3 -- -- 150 7/50 8 -- 150 7 --

Aluminum μg/m3 -- -- -- 5.1 -- --

Antimony μg/m3 13,000 1.46 -- -- -- --

Arsenic μg/m3 2,500 0.000441 -- 0.00045 -- 0.19

Barium μg/m3 -- -- -- 0.52 -- --

Bismuth μg/m3 -- -- -- -- -- --Bromine μg/m3 -- -- -- -- -- --Cadmium μg/m3 250 0.00105 -- 0.0011 -- --

Calcium μg/m3 -- -- -- -- -- --

Chlorine μg/m3 -- -- -- -- -- --Chromium μg/m3 100 0.000158 -- 0.00016 -- --

Cobalt μg/m3 10,000 0.000686 -- 0.00069 -- --

Copper μg/m3 -- -- -- -- -- 100

Gallium μg/m3 -- -- -- -- -- --

Germanium μg/m3 -- -- -- -- -- --Indium μg/m3 -- -- -- -- -- --Iron μg/m3 -- -- -- -- -- --Lanthanum μg/m3 -- -- -- -- -- --Lead μg/m3 -- -- 1.5 9 10 -- 1.5 9 10 --

Magnesium μg/m3 -- -- -- -- -- --

Manganese μg/m3 2,500 0.0521 -- 0.051 -- --

Mercury μg/m3 1,000 0.313 -- 0.31 -- 1.8

Molybdenum μg/m3 -- -- -- -- -- --

Nickel μg/m3 5,000 0.0079 -- 0.008 -- 6

Palladium μg/m3 -- -- -- -- -- --

Phosphorus μg/m3 -- -- -- -- -- --Potassium μg/m3 -- -- -- -- -- --Rubidium μg/m3 -- -- -- -- -- --Selenium μg/m3 500 18.3 -- -- -- --

Silicon μg/m3 -- -- -- -- -- --

Silver μg/m3 -- -- -- -- -- --Sodium μg/m3 -- -- -- -- -- --Strontium μg/m3 -- -- -- -- -- --Sulfur μg/m3 -- -- -- -- -- --Tin μg/m3 -- -- -- -- -- --Titanium μg/m3 -- -- -- 31 -- --Vanadium μg/m3 -- -- -- -- -- --Yttrium μg/m3 -- -- -- -- -- --Zinc μg/m3 -- -- -- -- -- --Zirconium μg/m3 -- -- -- -- -- --

Table Notes:

1 Arizona Department of Environmental Quality Acute and Chronic Ambient Air Concentrations, Title 18 Chapter 2 Article 17, December 2007 2 Arizona Department of Environmental Quality Ambient Air Quality Standards, Title 18 Chapter 2 Article 2, December 2007 Wind Speed: 3 EPA Region IX Preliminary Remediation Goals, Ambient Air, October 2004 mph 4 EPA National Ambient Air Quality Standards, http://www.epa.gov/air/criteria.html, February 2008 5 California Acute Reference Exposure Levels, March 1999 6 With the exception of arsenic, the averaging time for all listed analytes is one hour. The averaging time for arsenic is four hours7 The averaging time for the criteria is 24 hours.8 The averaging time for the criteria is the annual arithmetic mean. 9 The averaging time for the criteria is the quarterly average.10 Only the PM10 fraction is being measured not the total suspended particulates.11 Samples are anticipated to be rejected by EPA during validation.12 Percent of Total Mass13 Precipitation measurements are recorded manually by a Hayden-Winkelman High School employee; reliability cannot be verified Calm: < 114 Bold values with bold outline indicate the result exceeds one or more of the comparison criteria Wind direction15 Bold italicized values indicate the non-detected result exceeds one or more of the comparison criteria toward center16 * = The result is less than three times the level of uncertainty which is shown in place of the result.17 -- = Not established18 °C = Degrees Celsius19 % = Percent20 J = Estimated value21 mph = miles per hour22 NA = Not Applicable or Not Analyzed23 NPR = No precipitation recorded.24 NV = Not valid due to sample volume issues with the instrument.25 μg/m3 = Micrograms per cubic meter26 PM10 = particulate matter with a diameter less than or equal to 10 microns in size27 R = Rejected28 This table should be considered preliminary and will be revised based on incoming data, final data validation and QA/QC

California

Acute

Reference

Exposure

Levels5 6

EPA

National

Ambient

Air Quality

Standards4

EPA

Region IX

Preliminary

Remediation

Goal3

Avg Wind Speed mph):

Avg Ambient Relative Humidity (%):

Avg Wind Direction (degrees):

Avg Ambient Temperature (oC): Arizona

Ambient

Air Quality

Standards2

Precipitation (inches)7

:

Date:

Arizona

Hazardous Air

Pollutants

Ambient Air

Concentrations

(Acute)

1

Arizona

Hazardous Air

Pollutants

Ambient Air

Concentrations

(Chronic)

1 Result Percent12 Qual Result Percent12 Qual Result Percent12 

33.15 NA 17.26 NA R NA 

1.29 4.2770 0.3854 2.4340 R R 

0.0027 0.0034 * 0.0024 0.0000 * R R 

0.0081 0.0258 * 0.0063 0.0396 R R 

0.0142 0.0471 0.0051 0.0054 * R R 0.0133 0.0440 NA NA R R 

0.0036 0.0120 0.0013 0.0083 R R 0.0018 0.0011 * 0.0018 0.0006 * R R 

0.9078 3.0090 0.266 1.6800 R R 0.0895 0.2967 0.0154 0.0975 R R 

0.0009 0.0027 * 0.0009 0.0015 * R R 

0.0138 0.0000 * 0.0048 0.0000 * R R 

0.3412 1.1310 0.1273 0.8038 R R 0.0015 0.0000 * 0.0012 0.0000 * R R 0.0012 0.0000 * 0.0012 0.0000 * R R 0.0021 0.0000 * 0.0018 0.0000 * R R 

1.106 3.6660 0.3049 1.9250 R R 

0.0099 0.0000 * 0.0045 0.0000 * R R 0.0547 0.1812 0.0185 0.1166 R R 0.2324 0.7704 0.0712 0.4499 R R 0.0164 0.0543 0.0038 0.0241 R R 0.0021 0.0000 * 0.0021 0.0000 * R R 0.0054 0.0179 0.0027 0.0089 * R R 0.0024 0.0041 * 0.0021 0.0000 * R R 0.0021 0.0000 * 0.0018 0.0006 * R R 0.0061 0.0201 0.0033 0.0000 * R R 0.6488 2.1510 0.1996 1.2610 R R 0.0028 0.0094 0.0009 0.0027 * R R 0.0019 0.0062 0.0009 0.0027 * R R 

3.366 11.1600 1.06 6.6970 R R 

0.0018 0.0000 * 0.0018 0.0006 * R R 0.2058 0.4277 * 0.045 0.0000 * R R 0.0059 0.0197 0.0018 0.0116 R R 0.9685 3.2110 0.3642 2.3000 R R 0.0024 0.0002 * 0.0024 0.0012 * R R 0.1001 0.3320 0.0247 0.1561 R R 0.0036 0.0103 * 0.0012 0.0003 * R R 

0.0027 0.0000 * 0.0024 0.0000 * R R 

0.0347 0.1152 0.0153 0.0966 R R 

0.003 0.0100 0.0018 0.0059 * R R 

Calm: 5.26% Calm: 18.75% Calm: 31.25% 

6.1NA

06/03/08

4.35

249

28.2

5.6NA

06/06/08

4.66

238

26.2

06/09/08

3.48

225

30.1

5.8NA
TABLE 1

Air Filter Sampling Laboratory Values for Inorganic ParametersHayden Monitoring StationData Evaluation ReportASARCO LLC Hayden, Arizona Plant Site

Parameter Units

PM10 μg/m3 -- -- 150 7/50 8 -- 150 7 --

Aluminum μg/m3 -- -- -- 5.1 -- --

Antimony μg/m3 13,000 1.46 -- -- -- --

Arsenic μg/m3 2,500 0.000441 -- 0.00045 -- 0.19

Barium μg/m3 -- -- -- 0.52 -- --

Bismuth μg/m3 -- -- -- -- -- --Bromine μg/m3 -- -- -- -- -- --Cadmium μg/m3 250 0.00105 -- 0.0011 -- --

Calcium μg/m3 -- -- -- -- -- --

Chlorine μg/m3 -- -- -- -- -- --Chromium μg/m3 100 0.000158 -- 0.00016 -- --

Cobalt μg/m3 10,000 0.000686 -- 0.00069 -- --

Copper μg/m3 -- -- -- -- -- 100

Gallium μg/m3 -- -- -- -- -- --

Germanium μg/m3 -- -- -- -- -- --Indium μg/m3 -- -- -- -- -- --Iron μg/m3 -- -- -- -- -- --Lanthanum μg/m3 -- -- -- -- -- --Lead μg/m3 -- -- 1.5 9 10 -- 1.5 9 10 --

Magnesium μg/m3 -- -- -- -- -- --

Manganese μg/m3 2,500 0.0521 -- 0.051 -- --

Mercury μg/m3 1,000 0.313 -- 0.31 -- 1.8

Molybdenum μg/m3 -- -- -- -- -- --

Nickel μg/m3 5,000 0.0079 -- 0.008 -- 6

Palladium μg/m3 -- -- -- -- -- --

Phosphorus μg/m3 -- -- -- -- -- --Potassium μg/m3 -- -- -- -- -- --Rubidium μg/m3 -- -- -- -- -- --Selenium μg/m3 500 18.3 -- -- -- --

Silicon μg/m3 -- -- -- -- -- --

Silver μg/m3 -- -- -- -- -- --Sodium μg/m3 -- -- -- -- -- --Strontium μg/m3 -- -- -- -- -- --Sulfur μg/m3 -- -- -- -- -- --Tin μg/m3 -- -- -- -- -- --Titanium μg/m3 -- -- -- 31 -- --Vanadium μg/m3 -- -- -- -- -- --Yttrium μg/m3 -- -- -- -- -- --Zinc μg/m3 -- -- -- -- -- --Zirconium μg/m3 -- -- -- -- -- --

Table Notes:

1 Arizona Department of Environmental Quality Acute and Chronic Ambient Air Concentrations, Title 18 Chapter 2 Article 17, December 2007 2 Arizona Department of Environmental Quality Ambient Air Quality Standards, Title 18 Chapter 2 Article 2, December 2007 Wind Speed: 3 EPA Region IX Preliminary Remediation Goals, Ambient Air, October 2004 mph 4 EPA National Ambient Air Quality Standards, http://www.epa.gov/air/criteria.html, February 2008 5 California Acute Reference Exposure Levels, March 1999 6 With the exception of arsenic, the averaging time for all listed analytes is one hour. The averaging time for arsenic is four hours7 The averaging time for the criteria is 24 hours.8 The averaging time for the criteria is the annual arithmetic mean. 9 The averaging time for the criteria is the quarterly average.10 Only the PM10 fraction is being measured not the total suspended particulates.11 Samples are anticipated to be rejected by EPA during validation.12 Percent of Total Mass13 Precipitation measurements are recorded manually by a Hayden-Winkelman High School employee; reliability cannot be verified Calm: < 114 Bold values with bold outline indicate the result exceeds one or more of the comparison criteria Wind direction15 Bold italicized values indicate the non-detected result exceeds one or more of the comparison criteria toward center16 * = The result is less than three times the level of uncertainty which is shown in place of the result.17 -- = Not established18 °C = Degrees Celsius19 % = Percent20 J = Estimated value21 mph = miles per hour22 NA = Not Applicable or Not Analyzed23 NPR = No precipitation recorded.24 NV = Not valid due to sample volume issues with the instrument.25 μg/m3 = Micrograms per cubic meter26 PM10 = particulate matter with a diameter less than or equal to 10 microns in size27 R = Rejected28 This table should be considered preliminary and will be revised based on incoming data, final data validation and QA/QC

California

Acute

Reference

Exposure

Levels5 6

EPA

National

Ambient

Air Quality

Standards4

EPA

Region IX

Preliminary

Remediation

Goal3

Avg Wind Speed mph):

Avg Ambient Relative Humidity (%):

Avg Wind Direction (degrees):

Avg Ambient Temperature (oC): Arizona

Ambient

Air Quality

Standards2

Precipitation (inches)7

:

Date:

Arizona

Hazardous Air

Pollutants

Ambient Air

Concentrations

(Acute)

1

Arizona

Hazardous Air

Pollutants

Ambient Air

Concentrations

(Chronic)

1 Result Percent12 Qual Result Percent12 Qual Result Percent12 

60.24 NA 28.62 NA 12.91 NA 2.001 3.7060 0.7105 2.7330 0.2522 2.1310 

0.0089 0.0166 0.003 0.0092 * 0.0027 0.0000 

0.0263 0.0487 0.017 0.0652 0.0021 0.0171 

0.0239 0.0443 0.0116 0.0447 0.0051 0.0203 

0.032 0.0593 0.0607 0.2336 NA NA 

0.0024 0.0044 0.0021 0.0000 * 0.0018 0.0151 

0.0027 0.0021 * 0.0021 0.0072 * 0.0018 0.0000 

1.152 2.1340 0.5005 1.9250 0.2502 2.1140 

0.0105 0.0000 * 0.012 0.0000 * 0.0051 0.0000 0.0022 0.0041 0.0019 0.0072 0.0009 0.0000 

0.0318 0.0000 * 0.0141 0.0000 * 0.0045 0.0000 

1.126 2.0860 0.9327 3.5870 0.0743 0.6275 

0.0018 0.0000 * 0.0039 0.0000 * 0.0012 0.0000 0.0012 0.0000 * 0.0012 0.0000 * 0.0012 0.0000 0.0027 0.0000 * 0.0021 0.0000 * 0.0018 0.0000 

1.824 3.3790 1.122 4.3170 0.2707 2.2880 

0.0153 0.0000 * 0.0087 0.0000 * 0.0042 0.0183 0.1123 0.2080 0.3432 1.3200 0.0062 0.0521 

0.136 0.2519 0.1482 0.5699 0.0657 0.5555 

0.0272 0.0504 0.012 0.0460 0.003 0.0251 0.0021 0.0000 * 0.0024 0.0000 * 0.0021 0.0000 0.0138 0.0255 0.0172 0.0663 0.0027 0.0000 0.0021 0.0004 * 0.0024 0.0000 * 0.0021 0.0000 0.0024 0.0012 * 0.0021 0.0000 * 0.0018 0.0000 0.0078 0.0000 * 0.0054 0.0185 * 0.0039 0.0251 

1.061 1.9640 0.4368 1.6800 0.1712 1.4470 

0.0044 0.0081 0.0025 0.0098 0.0009 0.0004 0.0047 0.0086 0.0287 0.1103 0.0015 0.0123 

5.542 10.2600 1.893 7.2800 0.6691 5.6540 

0.0027 0.0027 * 0.0021 0.0051 * 0.0018 0.0000 0.1026 0.0141 * 0.066 0.0000 * 0.1634 1.3810 

0.0068 0.0126 0.0023 0.0089 0.0019 0.0163 

0.9092 1.6840 1.356 5.2150 0.6775 5.7260 0.0033 0.0005 * 0.0027 0.0072 * 0.0024 0.0000 0.1284 0.2378 0.0876 0.3370 0.0218 0.1846 0.0051 0.0000 * 0.003 0.0058 * 0.0012 0.0020 0.0012 0.0013 * 0.0027 0.0053 * 0.0015 0.0048 0.0674 0.1249 0.1395 0.5366 0.0054 0.0454 0.0055 0.0101 0.0041 0.0158 0.0018 0.0056 

Calm: 8.33% Calm: 2.08% Calm: 22.92% 

12.4

NA

20.7

NA

07/12/08

3.67

206

28.6

07/09/08

6.21

96

29.6

5.1NA

06/21/08

6.09

146

34.5
TABLE 1

Air Filter Sampling Laboratory Values for Inorganic ParametersHayden Monitoring StationData Evaluation ReportASARCO LLC Hayden, Arizona Plant Site

Parameter Units

PM10 μg/m3 -- -- 150 7/50 8 -- 150 7 --

Aluminum μg/m3 -- -- -- 5.1 -- --

Antimony μg/m3 13,000 1.46 -- -- -- --

Arsenic μg/m3 2,500 0.000441 -- 0.00045 -- 0.19

Barium μg/m3 -- -- -- 0.52 -- --

Bismuth μg/m3 -- -- -- -- -- --Bromine μg/m3 -- -- -- -- -- --Cadmium μg/m3 250 0.00105 -- 0.0011 -- --

Calcium μg/m3 -- -- -- -- -- --

Chlorine μg/m3 -- -- -- -- -- --Chromium μg/m3 100 0.000158 -- 0.00016 -- --

Cobalt μg/m3 10,000 0.000686 -- 0.00069 -- --

Copper μg/m3 -- -- -- -- -- 100

Gallium μg/m3 -- -- -- -- -- --

Germanium μg/m3 -- -- -- -- -- --Indium μg/m3 -- -- -- -- -- --Iron μg/m3 -- -- -- -- -- --Lanthanum μg/m3 -- -- -- -- -- --Lead μg/m3 -- -- 1.5 9 10 -- 1.5 9 10 --

Magnesium μg/m3 -- -- -- -- -- --

Manganese μg/m3 2,500 0.0521 -- 0.051 -- --

Mercury μg/m3 1,000 0.313 -- 0.31 -- 1.8

Molybdenum μg/m3 -- -- -- -- -- --

Nickel μg/m3 5,000 0.0079 -- 0.008 -- 6

Palladium μg/m3 -- -- -- -- -- --

Phosphorus μg/m3 -- -- -- -- -- --Potassium μg/m3 -- -- -- -- -- --Rubidium μg/m3 -- -- -- -- -- --Selenium μg/m3 500 18.3 -- -- -- --

Silicon μg/m3 -- -- -- -- -- --

Silver μg/m3 -- -- -- -- -- --Sodium μg/m3 -- -- -- -- -- --Strontium μg/m3 -- -- -- -- -- --Sulfur μg/m3 -- -- -- -- -- --Tin μg/m3 -- -- -- -- -- --Titanium μg/m3 -- -- -- 31 -- --Vanadium μg/m3 -- -- -- -- -- --Yttrium μg/m3 -- -- -- -- -- --Zinc μg/m3 -- -- -- -- -- --Zirconium μg/m3 -- -- -- -- -- --

Table Notes:

1 Arizona Department of Environmental Quality Acute and Chronic Ambient Air Concentrations, Title 18 Chapter 2 Article 17, December 2007 2 Arizona Department of Environmental Quality Ambient Air Quality Standards, Title 18 Chapter 2 Article 2, December 2007 Wind Speed: 3 EPA Region IX Preliminary Remediation Goals, Ambient Air, October 2004 mph 4 EPA National Ambient Air Quality Standards, http://www.epa.gov/air/criteria.html, February 2008 5 California Acute Reference Exposure Levels, March 1999 6 With the exception of arsenic, the averaging time for all listed analytes is one hour. The averaging time for arsenic is four hours7 The averaging time for the criteria is 24 hours.8 The averaging time for the criteria is the annual arithmetic mean. 9 The averaging time for the criteria is the quarterly average.10 Only the PM10 fraction is being measured not the total suspended particulates.11 Samples are anticipated to be rejected by EPA during validation.12 Percent of Total Mass13 Precipitation measurements are recorded manually by a Hayden-Winkelman High School employee; reliability cannot be verified Calm: < 114 Bold values with bold outline indicate the result exceeds one or more of the comparison criteria Wind direction15 Bold italicized values indicate the non-detected result exceeds one or more of the comparison criteria toward center16 * = The result is less than three times the level of uncertainty which is shown in place of the result.17 -- = Not established18 °C = Degrees Celsius19 % = Percent20 J = Estimated value21 mph = miles per hour22 NA = Not Applicable or Not Analyzed23 NPR = No precipitation recorded.24 NV = Not valid due to sample volume issues with the instrument.25 μg/m3 = Micrograms per cubic meter26 PM10 = particulate matter with a diameter less than or equal to 10 microns in size27 R = Rejected28 This table should be considered preliminary and will be revised based on incoming data, final data validation and QA/QC

California

Acute

Reference

Exposure

Levels5 6

EPA

National

Ambient

Air Quality

Standards4

EPA

Region IX

Preliminary

Remediation

Goal3

Avg Wind Speed mph):

Avg Ambient Relative Humidity (%):

Avg Wind Direction (degrees):

Avg Ambient Temperature (oC): Arizona

Ambient

Air Quality

Standards2

Precipitation (inches)7

:

Date:

Arizona

Hazardous Air

Pollutants

Ambient Air

Concentrations

(Acute)

1

Arizona

Hazardous Air

Pollutants

Ambient Air

Concentrations

(Chronic)

1 Result Percent12 Qual Result Percent12 Qual Result Percent12 

18.32 NA 25.49 NA 23.55 NA 

0.4081 2.4670 0.6469 2.8030 0.6554 3.0780 0.0027 0.0000 * 0.0027 0.0022 * 0.0027 0.0031 0.0193 0.1167 0.0011 0.0047 0.0039 0.0184 

0.006 0.0324 * 0.0072 0.0000 * 0.0066 0.0212 

0.0257 0.1551 NA NA NA NA 0.0009 0.0048 * 0.0035 0.0151 0.0037 0.0175 

0.0018 0.0094 * 0.0018 0.0000 * 0.0018 0.0031 

0.3812 2.3040 0.5005 2.1680 0.4175 1.9610 

0.0063 0.0236 * 0.4031 1.7460 0.2072 0.9732 

0.0009 0.0026 * 0.0009 0.0006 * 0.0009 0.0035 

0.0078 0.0000 * 0.0063 0.0000 * 0.0063 0.0000 

0.4575 2.7660 0.0678 0.2939 0.115 0.5402 0.0018 0.0000 * 0.0012 0.0008 * 0.0012 0.0000 0.0012 0.0000 * 0.0012 0.0004 * 0.0012 0.0002 0.0018 0.0000 * 0.0018 0.0000 * 0.0018 0.0000 0.6064 3.6660 0.4622 2.0020 0.4732 2.2220 0.0051 0.0000 * 0.0063 0.0049 * 0.0057 0.0000 0.0731 0.4418 0.0011 0.0047 0.0132 0.0619 0.0549 0.2997 * 0.1496 0.6480 0.117 0.5495 0.0051 0.0307 0.0086 0.0373 0.0104 0.0486 0.0024 0.0000 * 0.0021 0.0000 * 0.0021 0.0000 0.0132 0.0797 0.0027 0.0053 * 0.0069 0.0323 0.0024 0.0000 * 0.0024 0.0065 * 0.0021 0.0053 0.0018 0.0000 * 0.0018 0.0000 * 0.0018 0.0000 0.0042 0.0000 * 0.0045 0.0000 * 0.0042 0.0000 0.2213 1.3380 0.4158 1.8010 0.4134 1.9420 0.0012 0.0063 * 0.0012 0.0029 * 0.0011 0.0053 0.0077 0.0464 0.0016 0.0067 0.0011 0.0053 

1.147 6.9340 2.117 9.1730 1.948 9.1510 

0.0018 0.0000 * 0.0018 0.0008 * 0.0018 0.0004 0.1449 0.4574 * 0.6446 2.7920 0.3213 1.5090 

0.002 0.0120 0.0021 0.0092 0.0032 0.0148 

0.8894 5.3770 0.8687 3.7630 0.5947 2.7930 0.0027 0.0088 * 0.0027 0.0092 * 0.0027 0.0082 0.0325 0.1964 0.0427 0.1848 0.041 0.1924 0.0015 0.0026 * 0.0035 0.0151 0.0018 0.0088 0.0015 0.0000 * 0.0015 0.0000 * 0.0015 0.0009 

0.033 0.1995 0.0032 0.0137 0.0121 0.0568 

0.0021 0.0060 * 0.0018 0.0037 * 0.0018 0.0000 

Calm: 4.17% Calm: 18.75% Calm: 18.75% 

6.8NA

07/27/08

5.16

07/30/08

4.60

254

31.4

271

31.8

10.9

NA

6.9NA

07/24/08

4.41

138

31.9
TABLE 1

Air Filter Sampling Laboratory Values for Inorganic ParametersHayden Monitoring StationData Evaluation ReportASARCO LLC Hayden, Arizona Plant Site

Parameter Units

PM10 μg/m3 -- -- 150 7/50 8 -- 150 7 --

Aluminum μg/m3 -- -- -- 5.1 -- --

Antimony μg/m3 13,000 1.46 -- -- -- --

Arsenic μg/m3 2,500 0.000441 -- 0.00045 -- 0.19

Barium μg/m3 -- -- -- 0.52 -- --

Bismuth μg/m3 -- -- -- -- -- --Bromine μg/m3 -- -- -- -- -- --Cadmium μg/m3 250 0.00105 -- 0.0011 -- --

Calcium μg/m3 -- -- -- -- -- --

Chlorine μg/m3 -- -- -- -- -- --Chromium μg/m3 100 0.000158 -- 0.00016 -- --

Cobalt μg/m3 10,000 0.000686 -- 0.00069 -- --

Copper μg/m3 -- -- -- -- -- 100

Gallium μg/m3 -- -- -- -- -- --

Germanium μg/m3 -- -- -- -- -- --Indium μg/m3 -- -- -- -- -- --Iron μg/m3 -- -- -- -- -- --Lanthanum μg/m3 -- -- -- -- -- --Lead μg/m3 -- -- 1.5 9 10 -- 1.5 9 10 --

Magnesium μg/m3 -- -- -- -- -- --

Manganese μg/m3 2,500 0.0521 -- 0.051 -- --

Mercury μg/m3 1,000 0.313 -- 0.31 -- 1.8

Molybdenum μg/m3 -- -- -- -- -- --

Nickel μg/m3 5,000 0.0079 -- 0.008 -- 6

Palladium μg/m3 -- -- -- -- -- --

Phosphorus μg/m3 -- -- -- -- -- --Potassium μg/m3 -- -- -- -- -- --Rubidium μg/m3 -- -- -- -- -- --Selenium μg/m3 500 18.3 -- -- -- --

Silicon μg/m3 -- -- -- -- -- --

Silver μg/m3 -- -- -- -- -- --Sodium μg/m3 -- -- -- -- -- --Strontium μg/m3 -- -- -- -- -- --Sulfur μg/m3 -- -- -- -- -- --Tin μg/m3 -- -- -- -- -- --Titanium μg/m3 -- -- -- 31 -- --Vanadium μg/m3 -- -- -- -- -- --Yttrium μg/m3 -- -- -- -- -- --Zinc μg/m3 -- -- -- -- -- --Zirconium μg/m3 -- -- -- -- -- --

Table Notes:

1 Arizona Department of Environmental Quality Acute and Chronic Ambient Air Concentrations, Title 18 Chapter 2 Article 17, December 2007 2 Arizona Department of Environmental Quality Ambient Air Quality Standards, Title 18 Chapter 2 Article 2, December 2007 Wind Speed: 3 EPA Region IX Preliminary Remediation Goals, Ambient Air, October 2004 mph 4 EPA National Ambient Air Quality Standards, http://www.epa.gov/air/criteria.html, February 2008 5 California Acute Reference Exposure Levels, March 1999 6 With the exception of arsenic, the averaging time for all listed analytes is one hour. The averaging time for arsenic is four hours7 The averaging time for the criteria is 24 hours.8 The averaging time for the criteria is the annual arithmetic mean. 9 The averaging time for the criteria is the quarterly average.10 Only the PM10 fraction is being measured not the total suspended particulates.11 Samples are anticipated to be rejected by EPA during validation.12 Percent of Total Mass13 Precipitation measurements are recorded manually by a Hayden-Winkelman High School employee; reliability cannot be verified Calm: < 114 Bold values with bold outline indicate the result exceeds one or more of the comparison criteria Wind direction15 Bold italicized values indicate the non-detected result exceeds one or more of the comparison criteria toward center16 * = The result is less than three times the level of uncertainty which is shown in place of the result.17 -- = Not established18 °C = Degrees Celsius19 % = Percent20 J = Estimated value21 mph = miles per hour22 NA = Not Applicable or Not Analyzed23 NPR = No precipitation recorded.24 NV = Not valid due to sample volume issues with the instrument.25 μg/m3 = Micrograms per cubic meter26 PM10 = particulate matter with a diameter less than or equal to 10 microns in size27 R = Rejected28 This table should be considered preliminary and will be revised based on incoming data, final data validation and QA/QC

California

Acute

Reference

Exposure

Levels5 6

EPA

National

Ambient

Air Quality

Standards4

EPA

Region IX

Preliminary

Remediation

Goal3

Avg Wind Speed mph):

Avg Ambient Relative Humidity (%):

Avg Wind Direction (degrees):

Avg Ambient Temperature (oC): Arizona

Ambient

Air Quality

Standards2

Precipitation (inches)7

:

Date:

Arizona

Hazardous Air

Pollutants

Ambient Air

Concentrations

(Acute)

1

Arizona

Hazardous Air

Pollutants

Ambient Air

Concentrations

(Chronic)

1 Result Percent12 Qual Result Percent12 Qual Result Percent12 

35.79 NA 15.99 NA 23.43 NA 1.222 3.7980 0.2516 1.7200 0.6262 2.9470 

0.0057 0.0179 0.0082 0.0560 0.0146 0.0687 0.0122 0.0379 0.0214 0.1465 0.0283 0.1332 

0.0126 0.0391 0.006 0.0000 * 0.0074 0.0350 0.0103 0.0321 0.0554 0.3786 0.0547 0.2572 

0.003 0.0094 0.0015 0.0000 * 0.0018 0.0000 

0.0024 0.0016 * 0.0033 0.0225 0.0027 0.0066 

0.9949 3.0930 0.218 1.4910 0.3428 1.6130 

0.0237 0.0736 0.012 0.0000 * 0.015 0.0000 

0.0015 0.0045 * 0.0012 0.0042 * 0.0012 0.0042 

0.0291 0.0000 * 0.0087 0.0000 * 0.0126 0.0000 0.5123 1.5930 0.5127 3.5060 0.5358 2.5210 

0.0015 0.0000 * 0.0021 0.0000 * 0.0024 0.0000 0.0012 0.0000 * 0.0012 0.0000 * 0.0012 0.0000 0.0027 0.0000 * 0.0027 0.0000 * 0.003 0.0000 

1.661 5.1640 0.4639 3.1720 0.6931 3.2610 0.012 0.0000 * 0.006 0.0000 * 0.0069 0.0000 

0.0417 0.1295 0.1646 1.1250 0.1981 0.9324 

0.1669 0.5187 0.0607 0.4150 0.0363 0.1316 

0.0184 0.0572 0.0036 0.0248 0.0069 0.0323 

0.0021 0.0000 * 0.0021 0.0000 * 0.0024 0.0000 0.0099 0.0309 0.0055 0.0373 0.0134 0.0631 0.0021 0.0019 * 0.0021 0.0000 * 0.0021 0.0075 0.0024 0.0000 * 0.0024 0.0000 * 0.0024 0.0000 0.0063 0.0000 * 0.0048 0.0000 * 0.0057 0.0000 0.6997 2.1750 0.1646 1.1250 0.3947 1.8570 

0.0031 0.0097 0.0015 0.0100 0.0017 0.0082 0.0016 0.0048 0.007 0.0480 0.0175 0.0822 

3.224 10.0200 0.6794 4.6460 1.786 8.4060 

0.0024 0.0000 * 0.0024 0.0048 * 0.0024 0.0049 0.2039 0.6338 0.0546 0.1378 * 0.1614 0.4298 0.0053 0.0164 0.0009 0.0052 * 0.002 0.0095 

0.9718 3.0210 0.7336 5.0160 1.045 4.9170 

0.0036 0.0083 * 0.0036 0.0190 * 0.0036 0.0051 0.1077 0.3348 0.032 0.2186 0.0419 0.1970 

0.0036 0.0070 * 0.0015 0.0000 * 0.0018 0.0009 0.0012 0.0009 * 0.0012 0.0000 * 0.0012 0.0000 0.0427 0.1328 0.057 0.3895 0.0905 0.4259 0.0037 0.0114 0.0027 0.0184 0.0026 0.0122 

Calm: 0.00% Calm: 0.00% Calm: 0.00% 

8.7NA

08/17/08

5.34

171

30.5

19.4

NA

08/11/08

5.41

08/14/08

4.66

120

28.3

234

32.8

7.3NA
TABLE 1

Air Filter Sampling Laboratory Values for Inorganic ParametersHayden Monitoring StationData Evaluation ReportASARCO LLC Hayden, Arizona Plant Site

Parameter Units

PM10 μg/m3 -- -- 150 7/50 8 -- 150 7 --

Aluminum μg/m3 -- -- -- 5.1 -- --

Antimony μg/m3 13,000 1.46 -- -- -- --

Arsenic μg/m3 2,500 0.000441 -- 0.00045 -- 0.19

Barium μg/m3 -- -- -- 0.52 -- --

Bismuth μg/m3 -- -- -- -- -- --Bromine μg/m3 -- -- -- -- -- --Cadmium μg/m3 250 0.00105 -- 0.0011 -- --

Calcium μg/m3 -- -- -- -- -- --

Chlorine μg/m3 -- -- -- -- -- --Chromium μg/m3 100 0.000158 -- 0.00016 -- --

Cobalt μg/m3 10,000 0.000686 -- 0.00069 -- --

Copper μg/m3 -- -- -- -- -- 100

Gallium μg/m3 -- -- -- -- -- --

Germanium μg/m3 -- -- -- -- -- --Indium μg/m3 -- -- -- -- -- --Iron μg/m3 -- -- -- -- -- --Lanthanum μg/m3 -- -- -- -- -- --Lead μg/m3 -- -- 1.5 9 10 -- 1.5 9 10 --

Magnesium μg/m3 -- -- -- -- -- --

Manganese μg/m3 2,500 0.0521 -- 0.051 -- --

Mercury μg/m3 1,000 0.313 -- 0.31 -- 1.8

Molybdenum μg/m3 -- -- -- -- -- --

Nickel μg/m3 5,000 0.0079 -- 0.008 -- 6

Palladium μg/m3 -- -- -- -- -- --

Phosphorus μg/m3 -- -- -- -- -- --Potassium μg/m3 -- -- -- -- -- --Rubidium μg/m3 -- -- -- -- -- --Selenium μg/m3 500 18.3 -- -- -- --

Silicon μg/m3 -- -- -- -- -- --

Silver μg/m3 -- -- -- -- -- --Sodium μg/m3 -- -- -- -- -- --Strontium μg/m3 -- -- -- -- -- --Sulfur μg/m3 -- -- -- -- -- --Tin μg/m3 -- -- -- -- -- --Titanium μg/m3 -- -- -- 31 -- --Vanadium μg/m3 -- -- -- -- -- --Yttrium μg/m3 -- -- -- -- -- --Zinc μg/m3 -- -- -- -- -- --Zirconium μg/m3 -- -- -- -- -- --

Table Notes:

1 Arizona Department of Environmental Quality Acute and Chronic Ambient Air Concentrations, Title 18 Chapter 2 Article 17, December 2007 2 Arizona Department of Environmental Quality Ambient Air Quality Standards, Title 18 Chapter 2 Article 2, December 2007 Wind Speed: 3 EPA Region IX Preliminary Remediation Goals, Ambient Air, October 2004 mph 4 EPA National Ambient Air Quality Standards, http://www.epa.gov/air/criteria.html, February 2008 5 California Acute Reference Exposure Levels, March 1999 6 With the exception of arsenic, the averaging time for all listed analytes is one hour. The averaging time for arsenic is four hours7 The averaging time for the criteria is 24 hours.8 The averaging time for the criteria is the annual arithmetic mean. 9 The averaging time for the criteria is the quarterly average.10 Only the PM10 fraction is being measured not the total suspended particulates.11 Samples are anticipated to be rejected by EPA during validation.12 Percent of Total Mass13 Precipitation measurements are recorded manually by a Hayden-Winkelman High School employee; reliability cannot be verified Calm: < 114 Bold values with bold outline indicate the result exceeds one or more of the comparison criteria Wind direction15 Bold italicized values indicate the non-detected result exceeds one or more of the comparison criteria toward center16 * = The result is less than three times the level of uncertainty which is shown in place of the result.17 -- = Not established18 °C = Degrees Celsius19 % = Percent20 J = Estimated value21 mph = miles per hour22 NA = Not Applicable or Not Analyzed23 NPR = No precipitation recorded.24 NV = Not valid due to sample volume issues with the instrument.25 μg/m3 = Micrograms per cubic meter26 PM10 = particulate matter with a diameter less than or equal to 10 microns in size27 R = Rejected28 This table should be considered preliminary and will be revised based on incoming data, final data validation and QA/QC

California

Acute

Reference

Exposure

Levels5 6

EPA

National

Ambient

Air Quality

Standards4

EPA

Region IX

Preliminary

Remediation

Goal3

Avg Wind Speed mph):

Avg Ambient Relative Humidity (%):

Avg Wind Direction (degrees):

Avg Ambient Temperature (oC): Arizona

Ambient

Air Quality

Standards2

Precipitation (inches)7

:

Date:

Arizona

Hazardous Air

Pollutants

Ambient Air

Concentrations

(Acute)

1

Arizona

Hazardous Air

Pollutants

Ambient Air

Concentrations

(Chronic)

1 Result Percent12 Qual Result Percent12 Qual Result Percent12 

34.77 NA 56.77 NA 32.73 NA 

0.8277 2.6070 0.7726 1.4910 0.9511 3.1060 0.0037 0.0117 0.0054 0.0104 0.003 0.0000 0.0222 0.0698 0.1554 0.2998 0.0095 0.0309 

0.0062 0.0194 0.0293 0.0565 0.0078 0.0131 

NA NA NA NA NA NA 

0.0015 0.0025 * 0.0057 0.0000 * 0.0021 0.0068 

0.0024 0.0065 * 0.0203 0.0392 0.0021 0.0014 

0.5254 1.6550 0.8781 1.6940 0.7227 2.3600 0.0135 0.0424 0.0219 0.0226 * 0.0213 0.0696 0.0012 0.0037 0.0040 0.0077 0.0009 0.0026 

0.0099 0.0000 * 0.0291 0.0000 * 0.0126 0.0000 0.4854 1.5290 3.821 7.3710 0.2504 0.8176 0.0027 0.0000 * 0.0096 0.0000 * 0.0018 0.0000 0.0015 0.0000 * 0.0018 0.0000 * 0.0012 0.0000 0.0024 0.0000 * 0.0027 0.0045 * 0.0021 0.0000 0.7364 2.3190 2.26 4.3600 0.9699 3.1670 0.0063 0.0000 * 0.0111 0.0000 * 0.0084 0.0000 0.1263 0.3979 0.9676 1.8670 0.02 0.0652 0.1096 0.3452 0.0957 0.1351 * 0.2259 0.7375 0.0084 0.0265 0.0103 0.0199 0.0124 0.0406 0.0033 0.0000 * 0.0042 0.0000 * 0.0027 0.0002 0.0093 0.0292 0.085 0.1640 0.0048 0.0158 0.0033 0.0000 * 0.0036 0.0000 * 0.003 0.0061 0.0024 0.0000 * 0.0027 0.0000 * 0.0024 0.0000 0.0036 0.0000 * 0.012 0.0000 * 0.0036 0.0038 0.5203 1.6390 0.4668 0.9005 0.3818 1.2470 0.0017 0.0053 0.0076 0.0146 0.0015 0.0034 0.0036 0.0114 0.0458 0.0884 0.0016 0.0054 

2.299 7.2410 2.412 4.6530 2.556 8.3450 

0.0024 0.0047 * 0.01 0.0193 0.0021 0.0006 0.0558 0.0991 * 0.2298 0.0000 * 0.0507 0.0727 0.0035 0.0111 0.0036 0.0070 0.0051 0.0166 0.8061 2.5390 3.743 7.2210 0.5537 1.8080 0.0033 0.0085 * 0.0061 0.0117 0.0027 0.0000 0.0531 0.1671 0.0904 0.1744 0.0844 0.2757 0.0021 0.0025 * 0.0039 0.0068 * 0.0033 0.0095 0.0024 0.0000 * 0.0063 0.0053 * 0.0018 0.0002 0.0938 0.2954 0.7133 1.3760 0.0316 0.1033 0.0027 0.0040 * 0.005 0.0096 0.0032 0.0103 

Calm: 0.00% Calm: 0.00% 

10/06/08

3.60

117

22.0

6.2NA

5.6NA

8.9NA

09/30/08

7.27

69

30.2

09/24/08

5.65

110

29.3
TABLE 1

Air Filter Sampling Laboratory Values for Inorganic ParametersHayden Monitoring StationData Evaluation ReportASARCO LLC Hayden, Arizona Plant Site

Parameter Units

PM10 μg/m3 -- -- 150 7/50 8 -- 150 7 --

Aluminum μg/m3 -- -- -- 5.1 -- --

Antimony μg/m3 13,000 1.46 -- -- -- --

Arsenic μg/m3 2,500 0.000441 -- 0.00045 -- 0.19

Barium μg/m3 -- -- -- 0.52 -- --

Bismuth μg/m3 -- -- -- -- -- --Bromine μg/m3 -- -- -- -- -- --Cadmium μg/m3 250 0.00105 -- 0.0011 -- --

Calcium μg/m3 -- -- -- -- -- --

Chlorine μg/m3 -- -- -- -- -- --Chromium μg/m3 100 0.000158 -- 0.00016 -- --

Cobalt μg/m3 10,000 0.000686 -- 0.00069 -- --

Copper μg/m3 -- -- -- -- -- 100

Gallium μg/m3 -- -- -- -- -- --

Germanium μg/m3 -- -- -- -- -- --Indium μg/m3 -- -- -- -- -- --Iron μg/m3 -- -- -- -- -- --Lanthanum μg/m3 -- -- -- -- -- --Lead μg/m3 -- -- 1.5 9 10 -- 1.5 9 10 --

Magnesium μg/m3 -- -- -- -- -- --

Manganese μg/m3 2,500 0.0521 -- 0.051 -- --

Mercury μg/m3 1,000 0.313 -- 0.31 -- 1.8

Molybdenum μg/m3 -- -- -- -- -- --

Nickel μg/m3 5,000 0.0079 -- 0.008 -- 6

Palladium μg/m3 -- -- -- -- -- --

Phosphorus μg/m3 -- -- -- -- -- --Potassium μg/m3 -- -- -- -- -- --Rubidium μg/m3 -- -- -- -- -- --Selenium μg/m3 500 18.3 -- -- -- --

Silicon μg/m3 -- -- -- -- -- --

Silver μg/m3 -- -- -- -- -- --Sodium μg/m3 -- -- -- -- -- --Strontium μg/m3 -- -- -- -- -- --Sulfur μg/m3 -- -- -- -- -- --Tin μg/m3 -- -- -- -- -- --Titanium μg/m3 -- -- -- 31 -- --Vanadium μg/m3 -- -- -- -- -- --Yttrium μg/m3 -- -- -- -- -- --Zinc μg/m3 -- -- -- -- -- --Zirconium μg/m3 -- -- -- -- -- --

Table Notes:

1 Arizona Department of Environmental Quality Acute and Chronic Ambient Air Concentrations, Title 18 Chapter 2 Article 17, December 2007 2 Arizona Department of Environmental Quality Ambient Air Quality Standards, Title 18 Chapter 2 Article 2, December 2007 Wind Speed: 3 EPA Region IX Preliminary Remediation Goals, Ambient Air, October 2004 mph 4 EPA National Ambient Air Quality Standards, http://www.epa.gov/air/criteria.html, February 2008 5 California Acute Reference Exposure Levels, March 1999 6 With the exception of arsenic, the averaging time for all listed analytes is one hour. The averaging time for arsenic is four hours7 The averaging time for the criteria is 24 hours.8 The averaging time for the criteria is the annual arithmetic mean. 9 The averaging time for the criteria is the quarterly average.10 Only the PM10 fraction is being measured not the total suspended particulates.11 Samples are anticipated to be rejected by EPA during validation.12 Percent of Total Mass13 Precipitation measurements are recorded manually by a Hayden-Winkelman High School employee; reliability cannot be verified Calm: < 114 Bold values with bold outline indicate the result exceeds one or more of the comparison criteria Wind direction15 Bold italicized values indicate the non-detected result exceeds one or more of the comparison criteria toward center16 * = The result is less than three times the level of uncertainty which is shown in place of the result.17 -- = Not established18 °C = Degrees Celsius19 % = Percent20 J = Estimated value21 mph = miles per hour22 NA = Not Applicable or Not Analyzed23 NPR = No precipitation recorded.24 NV = Not valid due to sample volume issues with the instrument.25 μg/m3 = Micrograms per cubic meter26 PM10 = particulate matter with a diameter less than or equal to 10 microns in size27 R = Rejected28 This table should be considered preliminary and will be revised based on incoming data, final data validation and QA/QC

California

Acute

Reference

Exposure

Levels5 6

EPA

National

Ambient

Air Quality

Standards4

EPA

Region IX

Preliminary

Remediation

Goal3

Avg Wind Speed mph):

Avg Ambient Relative Humidity (%):

Avg Wind Direction (degrees):

Avg Ambient Temperature (oC): Arizona

Ambient

Air Quality

Standards2

Precipitation (inches)7

:

Date:

Arizona

Hazardous Air

Pollutants

Ambient Air

Concentrations

(Acute)

1

Arizona

Hazardous Air

Pollutants

Ambient Air

Concentrations

(Chronic)

1 Result Percent12 Qual Result Percent12 Qual Result Percent12 

R NA 177.21 NA 32.81 NA 

R R 7.213 4.2530 0.5057 3.9020 

R R 0.0042 0.0021 * 0.0033 0.0000 R R 0.0299 0.0177 0.0027 0.0029 R R 0.0596 0.0351 0.0066 0.0138 R R 0.0383 0.0226 NA NA R R 0.0019 0.0011 0.0012 0.0062 R R 0.003 0.0016 * 0.0021 0.0000 R R 3.902 2.3010 0.4625 3.5690 

R R 0.2103 0.1240 0.0083 0.0643 R R 0.0104 0.0061 0.0009 0.0029 

R R 0.0573 0.0000 * 0.0072 0.0000 R R 1.172 0.6913 0.0845 0.6518 R R 0.0027 0.0000 * 0.0018 0.0000 R R 0.0018 0.0000 * 0.0015 0.0007 R R 0.0027 0.0000 * 0.0021 0.0000 R R 7.161 4.2230 0.5989 4.6220 

R R 0.0552 0.0000 * 0.0072 0.0000 R R 0.0887 0.0523 0.0071 0.0545 

R R 1.273 0.7505 0.1311 1.0120 R R 0.1113 0.0656 0.0096 0.0741 R R 0.0039 0.0000 * 0.003 0.0109 R R 0.0428 0.0253 0.0033 0.0109 R R 0.0042 0.0001 * 0.003 0.0149 R R 0.003 0.0000 * 0.0024 0.0000 R R 0.0216 0.0026 * 0.0027 0.0000 R R 3.573 2.1070 0.2516 1.9410 R R 0.0274 0.0162 0.0017 0.0134 R R 0.0074 0.0044 0.0012 0.0015 R R 18.74 11.0500 1.427 11.0100 R R 0.003 0.0011 * 0.0021 0.0004 R R 1.6269 0.5450 * 0.1143 0.6431 R R 0.0347 0.0205 0.0027 0.0211 R R 1.688 0.9953 0.1282 0.9894 R R 0.0047 0.0028 0.0027 0.0069 R R 0.6163 0.3634 0.0686 0.5290 

R R 0.0266 0.0157 0.0027 0.0113 

R R 0.0047 0.0027 0.0021 0.0000 R R 0.1012 0.0597 0.0083 0.0643 R R 0.0263 0.0155 0.0024 0.0047 

Calm: 0.00% Calm: 0.00% Calm: 10.00% 

10.4

NA

11/12/08

2.11

129

7.8

12.7

NA

10/28/08

9.13

11/09/08

6.46

168

13.0

52

25.0

6.2NA
TABLE 1

Air Filter Sampling Laboratory Values for Inorganic ParametersHayden Monitoring StationData Evaluation ReportASARCO LLC Hayden, Arizona Plant Site

Parameter Units

PM10 μg/m3 -- -- 150 7/50 8 -- 150 7 --

Aluminum μg/m3 -- -- -- 5.1 -- --

Antimony μg/m3 13,000 1.46 -- -- -- --

Arsenic μg/m3 2,500 0.000441 -- 0.00045 -- 0.19

Barium μg/m3 -- -- -- 0.52 -- --

Bismuth μg/m3 -- -- -- -- -- --Bromine μg/m3 -- -- -- -- -- --Cadmium μg/m3 250 0.00105 -- 0.0011 -- --

Calcium μg/m3 -- -- -- -- -- --

Chlorine μg/m3 -- -- -- -- -- --Chromium μg/m3 100 0.000158 -- 0.00016 -- --

Cobalt μg/m3 10,000 0.000686 -- 0.00069 -- --

Copper μg/m3 -- -- -- -- -- 100

Gallium μg/m3 -- -- -- -- -- --

Germanium μg/m3 -- -- -- -- -- --Indium μg/m3 -- -- -- -- -- --Iron μg/m3 -- -- -- -- -- --Lanthanum μg/m3 -- -- -- -- -- --Lead μg/m3 -- -- 1.5 9 10 -- 1.5 9 10 --

Magnesium μg/m3 -- -- -- -- -- --

Manganese μg/m3 2,500 0.0521 -- 0.051 -- --

Mercury μg/m3 1,000 0.313 -- 0.31 -- 1.8

Molybdenum μg/m3 -- -- -- -- -- --

Nickel μg/m3 5,000 0.0079 -- 0.008 -- 6

Palladium μg/m3 -- -- -- -- -- --

Phosphorus μg/m3 -- -- -- -- -- --Potassium μg/m3 -- -- -- -- -- --Rubidium μg/m3 -- -- -- -- -- --Selenium μg/m3 500 18.3 -- -- -- --

Silicon μg/m3 -- -- -- -- -- --

Silver μg/m3 -- -- -- -- -- --Sodium μg/m3 -- -- -- -- -- --Strontium μg/m3 -- -- -- -- -- --Sulfur μg/m3 -- -- -- -- -- --Tin μg/m3 -- -- -- -- -- --Titanium μg/m3 -- -- -- 31 -- --Vanadium μg/m3 -- -- -- -- -- --Yttrium μg/m3 -- -- -- -- -- --Zinc μg/m3 -- -- -- -- -- --Zirconium μg/m3 -- -- -- -- -- --

Table Notes:

1 Arizona Department of Environmental Quality Acute and Chronic Ambient Air Concentrations, Title 18 Chapter 2 Article 17, December 2007 2 Arizona Department of Environmental Quality Ambient Air Quality Standards, Title 18 Chapter 2 Article 2, December 2007 Wind Speed: 3 EPA Region IX Preliminary Remediation Goals, Ambient Air, October 2004 mph 4 EPA National Ambient Air Quality Standards, http://www.epa.gov/air/criteria.html, February 2008 5 California Acute Reference Exposure Levels, March 1999 6 With the exception of arsenic, the averaging time for all listed analytes is one hour. The averaging time for arsenic is four hours7 The averaging time for the criteria is 24 hours.8 The averaging time for the criteria is the annual arithmetic mean. 9 The averaging time for the criteria is the quarterly average.10 Only the PM10 fraction is being measured not the total suspended particulates.11 Samples are anticipated to be rejected by EPA during validation.12 Percent of Total Mass13 Precipitation measurements are recorded manually by a Hayden-Winkelman High School employee; reliability cannot be verified Calm: < 114 Bold values with bold outline indicate the result exceeds one or more of the comparison criteria Wind direction15 Bold italicized values indicate the non-detected result exceeds one or more of the comparison criteria toward center16 * = The result is less than three times the level of uncertainty which is shown in place of the result.17 -- = Not established18 °C = Degrees Celsius19 % = Percent20 J = Estimated value21 mph = miles per hour22 NA = Not Applicable or Not Analyzed23 NPR = No precipitation recorded.24 NV = Not valid due to sample volume issues with the instrument.25 μg/m3 = Micrograms per cubic meter26 PM10 = particulate matter with a diameter less than or equal to 10 microns in size27 R = Rejected28 This table should be considered preliminary and will be revised based on incoming data, final data validation and QA/QC

California

Acute

Reference

Exposure

Levels5 6

EPA

National

Ambient

Air Quality

Standards4

EPA

Region IX

Preliminary

Remediation

Goal3

Avg Wind Speed mph):

Avg Ambient Relative Humidity (%):

Avg Wind Direction (degrees):

Avg Ambient Temperature (oC): Arizona

Ambient

Air Quality

Standards2

Precipitation (inches)7

:

Date:

Arizona

Hazardous Air

Pollutants

Ambient Air

Concentrations

(Acute)

1

Arizona

Hazardous Air

Pollutants

Ambient Air

Concentrations

(Chronic)

1 Result Percent12 Qual

21.24 NA

0.5094 2.82400.0092 0.05120.0169 0.09370.0069 0.0256 *0.0133 0.07360.0015 0.00840.0027 0.0047 *0.3144 1.74200.0072 0.0000 *

0.0012 0.0052 *

0.0078 0.0000 *0.1819 1.00800.0015 0.0000 *0.0012 0.0000 *0.0027 0.0000 *0.5528 3.06400.0069 0.0000 *0.0328 0.18160.0567 0.2330 *

0.005 0.0277

0.0024 0.0000 *0.0045 0.02480.0024 0.0000 *0.0024 0.0000 *0.0045 0.0000 *0.3112 1.72500.0009 0.0029 *0.0044 0.0245

1.31 7.2630

0.0024 0.0000 *0.0495 0.0010 *0.0014 0.00760.4751 2.63300.0033 0.0031 *0.0471 0.26100.0018 0.0003 *0.0015 0.0000 *0.0217 0.12000.0018 0.0060 *

Calm: 9.52%

25.1

NA

11/30/08

3.36

259

12.1
TABLE 2

Air Filter Sampling Laboratory Values for Inorganic ParametersWinkelman Monitoring StationData Evaluation ReportASARCO LLC Hayden, Arizona Plant Site

Parameter Units Result Percent11 Qual Result Percent11 Qual Result Percent1

PM10 μg/m3 -- -- 150 7/50 8 -- 150 7 -- 17.61 NA 10.44 NA 9.8 NA 

Aluminum μg/m3 -- -- -- 5.1 -- -- 0.1953 1.1290 0.1867 1.8220 0.2025 2.1410 

Antimony μg/m3 13,000 1.46 -- -- -- -- 0.003 0.0144 * 0.0027 0.0041 * 0.0030 0.0174 

Arsenic μg/m3 2,500 0.000441 -- 0.00045 -- 0.19 0.0249 0.1440 0.0048 0.0473 0.0049 0.0523 

Barium μg/m3 -- -- -- 0.52 -- -- 0.0129 0.0743 0.0042 0.0069 * 0.0048 0.0005 

Bismuth μg/m3 -- -- -- -- -- -- 0.0472 0.2728 NA NA NA NA 

Bromine μg/m3 -- -- -- -- -- -- 0.0018 0.0008 * 0.0014 0.0133 0.0009 0.0095 Cadmium μg/m3 250 0.00105 -- 0.0011 -- -- 0.0024 0.0084 * 0.0024 0.0000 * 0.0018 0.0000 

Calcium μg/m3 -- -- -- -- -- -- 0.2573 1.4880 0.2064 2.0130 0.2365 2.5000 

Chlorine μg/m3 -- -- -- -- -- -- 0.0135 0.0000 * 0.0051 0.0000 * 0.2168 2.2920 Chromium μg/m3 100 0.000158 -- 0.00016 -- -- 0.0009 0.0000 * 0.0009 0.0023 * 0.0009 0.0045 

Cobalt μg/m3 10,000 0.000686 -- 0.00069 -- -- 0.0087 0.0000 * 0.0045 0.0000 * 0.0045 0.0000 

Copper μg/m3 -- -- -- -- -- 100 0.9360 5.4130 0.1093 1.0670 0.0788 0.8333 

Gallium μg/m3 -- -- -- -- -- -- 0.0024 0.0000 * 0.0009 0.0000 * 0.0012 0.0000 

Germanium μg/m3 -- -- -- -- -- -- 0.0009 0.0000 * 0.0009 0.0000 * 0.0012 0.0085 Indium μg/m3 -- -- -- -- -- -- 0.0024 0.0000 * 0.0024 0.0000 * 0.0021 0.0000 Iron μg/m3 -- -- -- -- -- -- 0.4438 2.5660 0.1831 1.7860 0.1768 1.8690 

Lanthanum μg/m3 -- -- -- -- -- -- 0.0051 0.0000 * 0.0045 0.0101 * 0.0075 0.0000 

Lead μg/m3 -- -- 1.5 9 10 -- 1.5 9 10 -- 0.2067 1.1960 0.0181 0.1764 0.0155 0.1643 

Magnesium μg/m3 -- -- -- -- -- -- 0.0249 0.0400 * 0.0342 0.1952 * 0.0429 0.4540 

Manganese μg/m3 2,500 0.0521 -- 0.051 -- -- 0.0037 0.0212 0.0019 0.0188 0.0026 0.0274 

Mercury μg/m3 1,000 0.313 -- 0.31 -- 1.8 0.0018 0.0000 * 0.0015 0.0000 * 0.0027 0.0134 

Molybdenum μg/m3 -- -- -- -- -- -- 0.0079 0.0457 0.0018 0.0041 * 0.0033 0.0080 

Nickel μg/m3 5,000 0.0079 -- 0.008 -- 6 0.0015 0.0000 * 0.0019 0.0188 0.0024 0.0000 

Palladium μg/m3 -- -- -- -- -- -- 0.0021 0.0000 * 0.0021 0.0000 * 0.0018 0.0000 

Phosphorus μg/m3 -- -- -- -- -- -- 0.0048 0.0000 * 0.0036 0.0000 * 0.0033 0.0000 Potassium μg/m3 -- -- -- -- -- -- 0.1426 0.8248 0.0913 0.8911 0.1071 1.1320 

Rubidium μg/m3 -- -- -- -- -- -- 0.0012 0.0071 0.0006 0.0000 * 0.0012 0.0025 

Selenium μg/m3 500 18.3 -- -- -- -- 0.0100 0.0577 0.0039 0.0377 0.0014 0.0149 

Silicon μg/m3 -- -- -- -- -- -- 0.6173 3.5700 0.5113 4.9890 0.5532 5.8490 Silver μg/m3 -- -- -- -- -- -- 0.0024 0.0084 * 0.0021 0.0000 * 0.0018 0.0000 Sodium μg/m3 -- -- -- -- -- -- 0.1866 1.0550 * 0.1236 0.5880 * 0.2351 2.4860 Strontium μg/m3 -- -- -- -- -- -- 0.0016 0.0090 0.0014 0.0138 0.0027 0.0289 

Sulfur μg/m3 -- -- -- -- -- -- 1.3870 8.0220 0.4422 4.3140 0.2147 2.2700 Tin μg/m3 -- -- -- -- -- -- 0.0027 0.0030 * 0.003 0.0239 * 0.0030 0.0080 

Titanium μg/m3 -- -- -- 31 -- -- 0.0193 0.1116 0.0177 0.1727 0.0170 0.1792 

Vanadium μg/m3 -- -- -- -- -- -- 0.0012 0.0000 * 0.0009 0.0000 * 0.0012 0.0015 

Yttrium μg/m3 -- -- -- -- -- -- 0.0021 0.0000 * 0.0009 0.0000 * 0.0018 0.0050 Zinc μg/m3 -- -- -- -- -- -- 0.0723 0.4180 0.0137 0.1341 0.0120 0.1269 

Zirconium μg/m3 -- -- -- -- -- -- 0.0012 0.0046 * 0.0012 0.0014 * 0.0024 0.0025 

Table Notes:

1 Arizona Department of Environmental Quality Acute and Chronic Ambient Air Concentrations, Title 18 Chapter 2 Article 17, December 2007 2 Arizona Department of Environmental Quality Ambient Air Quality Standards, Title 18 Chapter 2 Article 2, December 2007 Wind Speed: 3 EPA Region IX Preliminary Remediation Goals, Ambient Air, October 2004 mph 4 EPA National Ambient Air Quality Standards, http://www.epa.gov/air/criteria.html, February 2008 5 California Acute Reference Exposure Levels, March 1999 6 With the exception of arsenic, the averaging time for all listed analytes is one hour. The averaging time for arsenic is four hours. 7 The averaging time for the criteria is 24 hours. 8 The averaging time for the criteria is the annual arithmetic mean. 9 The averaging time for the criteria is the quarterly average.10 Only the PM10 fraction is being measured not the total suspended particulates.11 Percent of Total Mass12 Precipitation measurements are recorded manually by a Hayden-Winkelman High School employee; reliability cannot be verified.13 Bold values with bold outline indicate the result exceeds one or more of the comparison criteria.14 Bold italicized values indicate the non-detected result exceeds one or more of the comparison criteria. Calm: < 115 * = The result is less than three times the level of uncertainty which is shown in place of the result. Wind direction16 -- = Not established toward center

Calm: 35.42%

Calm: 29.17%

Calm: 10.42%

17 °C = Degrees Celsius18 % = Percent19 J = Estimated value20 mph = miles per hour21 NA = Not Applicable or Not Analyzed22 NPR = No precipitation recorded.23 μg/m3 = Micrograms per cubic meter24 PM10 = particulate matter with a diameter less than or equal to 10 microns in size25 R = Rejected26 This table should be considered preliminary and will be revised based on incoming data, final data validation and QA/QC.

16.6

NA

2/23/08

4.91

296

14.2

1/12/2008 2/17/2008

1.68 2.98

281 315

NA NA

9.8 9.3

19.4 24.0

California

Acute

Reference

Exposure

Levels5 6

Arizona

Hazardous Air

Pollutants

Ambient Air

Concentrations

(Acute)1

Arizona

Ambient

Air Quality

Standards2

Avg Ambient Relative Humidity (%):

Avg Wind Direction (degrees):

Avg Ambient Temperature (oC):

Avg Wind Speed (mph):

EPA

Region IX

Preliminary

Remediation

Goal3

Precipitation (inches)3

:

Date:

Arizona

Hazardous Air

Pollutants

Ambient Air

Concentrations

(Chronic)1

EPA

National

Ambient

Air Quality

Standards4
TABLE 2

Air Filter Sampling Laboratory Values for Inorganic ParametersWinkelman Monitoring StationData Evaluation ReportASARCO LLC Hayden, Arizona Plant Site

Parameter Units

PM10 μg/m3 -- -- 150 7/50 8 -- 150 7 --

Aluminum μg/m3 -- -- -- 5.1 -- --

Antimony μg/m3 13,000 1.46 -- -- -- --

Arsenic μg/m3 2,500 0.000441 -- 0.00045 -- 0.19

Barium μg/m3 -- -- -- 0.52 -- --

Bismuth μg/m3 -- -- -- -- -- --Bromine μg/m3 -- -- -- -- -- --Cadmium μg/m3 250 0.00105 -- 0.0011 -- --

Calcium μg/m3 -- -- -- -- -- --

Chlorine μg/m3 -- -- -- -- -- --Chromium μg/m3 100 0.000158 -- 0.00016 -- --Cobalt μg/m3 10,000 0.000686 -- 0.00069 -- --

Copper μg/m3 -- -- -- -- -- 100

Gallium μg/m3 -- -- -- -- -- --Germanium μg/m3 -- -- -- -- -- --Indium μg/m3 -- -- -- -- -- --Iron μg/m3 -- -- -- -- -- --Lanthanum μg/m3 -- -- -- -- -- --Lead μg/m3 -- -- 1.5 9 10 -- 1.5 9 10 --

Magnesium μg/m3 -- -- -- -- -- --

Manganese μg/m3 2,500 0.0521 -- 0.051 -- --

Mercury μg/m3 1,000 0.313 -- 0.31 -- 1.8

Molybdenum μg/m3 -- -- -- -- -- --

Nickel μg/m3 5,000 0.0079 -- 0.008 -- 6

Palladium μg/m3 -- -- -- -- -- --

Phosphorus μg/m3 -- -- -- -- -- --Potassium μg/m3 -- -- -- -- -- --Rubidium μg/m3 -- -- -- -- -- --Selenium μg/m3 500 18.3 -- -- -- --

Silicon μg/m3 -- -- -- -- -- --

Silver μg/m3 -- -- -- -- -- --Sodium μg/m3 -- -- -- -- -- --Strontium μg/m3 -- -- -- -- -- --Sulfur μg/m3 -- -- -- -- -- --Tin μg/m3 -- -- -- -- -- --Titanium μg/m3 -- -- -- 31 -- --Vanadium μg/m3 -- -- -- -- -- --Yttrium μg/m3 -- -- -- -- -- --Zinc μg/m3 -- -- -- -- -- --Zirconium μg/m3 -- -- -- -- -- --

Table Notes:

1 Arizona Department of Environmental Quality Acute and Chronic Ambient Air Concentrations, Title 18 Chapter 2 Article 17, December 2007 2 Arizona Department of Environmental Quality Ambient Air Quality Standards, Title 18 Chapter 2 Article 2, December 2007 Wind Speed: 3 EPA Region IX Preliminary Remediation Goals, Ambient Air, October 2004 mph 4 EPA National Ambient Air Quality Standards, http://www.epa.gov/air/criteria.html, February 2008 5 California Acute Reference Exposure Levels, March 1999 6 With the exception of arsenic, the averaging time for all listed analytes is one hour. The averaging time for arsenic is four hours. 7 The averaging time for the criteria is 24 hours. 8 The averaging time for the criteria is the annual arithmetic mean. 9 The averaging time for the criteria is the quarterly average.10 Only the PM10 fraction is being measured not the total suspended particulates.11 Percent of Total Mass12 Precipitation measurements are recorded manually by a Hayden-Winkelman High School employee; reliability cannot be verified.13 Bold values with bold outline indicate the result exceeds one or more of the comparison criteria.14 Bold italicized values indicate the non-detected result exceeds one or more of the comparison criteria. Calm: < 115 * = The result is less than three times the level of uncertainty which is shown in place of the result. Wind direction16 -- = Not established toward center17 °C = Degrees Celsius18 % = Percent19 J = Estimated value20 mph = miles per hour21 NA = Not Applicable or Not Analyzed22 NPR = No precipitation recorded.23 μg/m3 = Micrograms per cubic meter24 PM10 = particulate matter with a diameter less than or equal to 10 microns in size25 R = Rejected26 This table should be considered preliminary and will be revised based on incoming data, final data validation and QA/QC.

California

Acute

Reference

Exposure

Levels5 6

Arizona

Hazardous Air

Pollutants

Ambient Air

Concentrations

(Acute)1

Arizona

Ambient

Air Quality

Standards2

Avg Ambient Relative Humidity (%):

Avg Wind Direction (degrees):

Avg Ambient Temperature (oC):

Avg Wind Speed (mph):

EPA

Region IX

Preliminary

Remediation

Goal3

Precipitation (inches)3

:

Date:

Arizona

Hazardous Air

Pollutants

Ambient Air

Concentrations

(Chronic)1

EPA

National

Ambient

Air Quality

Standards4 Result Percent11 Qual Result Percent11 Qual Result Percent1

15.58 NA 26.05 NA R NA 

0.3645 2.5880 0.7491 3.0840 R R 0.0024 0.0000 * 0.0027 0.0109 * R R 

0.0129 0.0913 0.0065 0.0266 R R 

0.0048 0.0000 * 0.012 0.0494 R R 0.0092 0.0655 0.0061 0.0250 NA NA 

0.0009 0.0033 * 0.0037 0.0153 R R 0.0018 0.0027 * 0.0018 0.0033 * R R 0.3159 2.2430 0.7185 2.9580 R R 

0.0048 0.0000 * 0.0066 0.0240 * R R 

0.0029 0.0204 0.0021 0.0087 R R 

0.0045 0.0000 * 0.018 0.0000 * R R 

0.1704 1.2100 0.8042 3.3110 R R 

0.0012 0.0000 * 0.0015 0.0000 * R R 0.0009 0.0020 * 0.0012 0.0000 * R R 0.0018 0.0000 * 0.0018 0.0014 * R R 0.3048 2.1640 1.457 5.9970 R R 0.0042 0.0000 * 0.0069 0.0000 * R R 0.0309 0.2196 0.0375 0.1545 R R 

0.0506 0.3594 0.183 0.7532 R R 

0.0048 0.0344 0.0104 0.0428 R R 

0.0018 0.0094 * 0.0021 0.0000 * R R 

0.0024 0.0000 * 0.0117 0.0481 R R 0.0021 0.0027 * 0.0024 0.0000 * R R 0.0018 0.0000 * 0.0018 0.0000 * R R 0.0036 0.0000 * 0.0052 0.0213 R R 0.1659 1.1780 0.3093 1.2730 R R 

0.0009 0.0053 * 0.0016 0.0064 R R 

0.0019 0.0137 0.0035 0.0145 R R 0.9506 6.7500 1.974 8.1250 R R 0.0018 0.0007 * 0.0018 0.0002 * R R 0.0447 0.1611 * 0.0573 0.0000 * R R 0.0027 0.0194 0.0058 0.0240 R R 

0.5923 4.2060 0.7166 2.9500 R R 0.0024 0.0053 * 0.0024 0.0000 * R R 

0.0234 0.1662 0.0582 0.2396 R R 

0.0012 0.0000 * 0.0024 0.0033 * R R 

0.0024 0.0000 * 0.0024 0.0000 * R R 

0.024 0.1705 0.0488 0.2008 R R 

0.0015 0.0053 * 0.0018 0.0060 * R R 

Calm: 22.92% Calm: 6.25% Calm: 31.25% 

5/22/08

7.33

5/28/08

5.03

310

25.2

6.9NA

267

17.6

5.6NA

22.0

NA

5/19/08

4.97

292

31.1
TABLE 2

Air Filter Sampling Laboratory Values for Inorganic ParametersWinkelman Monitoring StationData Evaluation ReportASARCO LLC Hayden, Arizona Plant Site

Parameter Units

PM10 μg/m3 -- -- 150 7/50 8 -- 150 7 --

Aluminum μg/m3 -- -- -- 5.1 -- --

Antimony μg/m3 13,000 1.46 -- -- -- --

Arsenic μg/m3 2,500 0.000441 -- 0.00045 -- 0.19

Barium μg/m3 -- -- -- 0.52 -- --

Bismuth μg/m3 -- -- -- -- -- --Bromine μg/m3 -- -- -- -- -- --Cadmium μg/m3 250 0.00105 -- 0.0011 -- --

Calcium μg/m3 -- -- -- -- -- --

Chlorine μg/m3 -- -- -- -- -- --Chromium μg/m3 100 0.000158 -- 0.00016 -- --Cobalt μg/m3 10,000 0.000686 -- 0.00069 -- --

Copper μg/m3 -- -- -- -- -- 100

Gallium μg/m3 -- -- -- -- -- --Germanium μg/m3 -- -- -- -- -- --Indium μg/m3 -- -- -- -- -- --Iron μg/m3 -- -- -- -- -- --Lanthanum μg/m3 -- -- -- -- -- --Lead μg/m3 -- -- 1.5 9 10 -- 1.5 9 10 --

Magnesium μg/m3 -- -- -- -- -- --

Manganese μg/m3 2,500 0.0521 -- 0.051 -- --

Mercury μg/m3 1,000 0.313 -- 0.31 -- 1.8

Molybdenum μg/m3 -- -- -- -- -- --

Nickel μg/m3 5,000 0.0079 -- 0.008 -- 6

Palladium μg/m3 -- -- -- -- -- --

Phosphorus μg/m3 -- -- -- -- -- --Potassium μg/m3 -- -- -- -- -- --Rubidium μg/m3 -- -- -- -- -- --Selenium μg/m3 500 18.3 -- -- -- --

Silicon μg/m3 -- -- -- -- -- --

Silver μg/m3 -- -- -- -- -- --Sodium μg/m3 -- -- -- -- -- --Strontium μg/m3 -- -- -- -- -- --Sulfur μg/m3 -- -- -- -- -- --Tin μg/m3 -- -- -- -- -- --Titanium μg/m3 -- -- -- 31 -- --Vanadium μg/m3 -- -- -- -- -- --Yttrium μg/m3 -- -- -- -- -- --Zinc μg/m3 -- -- -- -- -- --Zirconium μg/m3 -- -- -- -- -- --

Table Notes:

1 Arizona Department of Environmental Quality Acute and Chronic Ambient Air Concentrations, Title 18 Chapter 2 Article 17, December 2007 2 Arizona Department of Environmental Quality Ambient Air Quality Standards, Title 18 Chapter 2 Article 2, December 2007 Wind Speed: 3 EPA Region IX Preliminary Remediation Goals, Ambient Air, October 2004 mph 4 EPA National Ambient Air Quality Standards, http://www.epa.gov/air/criteria.html, February 2008 5 California Acute Reference Exposure Levels, March 1999 6 With the exception of arsenic, the averaging time for all listed analytes is one hour. The averaging time for arsenic is four hours. 7 The averaging time for the criteria is 24 hours. 8 The averaging time for the criteria is the annual arithmetic mean. 9 The averaging time for the criteria is the quarterly average.10 Only the PM10 fraction is being measured not the total suspended particulates.11 Percent of Total Mass12 Precipitation measurements are recorded manually by a Hayden-Winkelman High School employee; reliability cannot be verified.13 Bold values with bold outline indicate the result exceeds one or more of the comparison criteria.14 Bold italicized values indicate the non-detected result exceeds one or more of the comparison criteria. Calm: < 115 * = The result is less than three times the level of uncertainty which is shown in place of the result. Wind direction16 -- = Not established toward center17 °C = Degrees Celsius18 % = Percent19 J = Estimated value20 mph = miles per hour21 NA = Not Applicable or Not Analyzed22 NPR = No precipitation recorded.23 μg/m3 = Micrograms per cubic meter24 PM10 = particulate matter with a diameter less than or equal to 10 microns in size25 R = Rejected26 This table should be considered preliminary and will be revised based on incoming data, final data validation and QA/QC.

California

Acute

Reference

Exposure

Levels5 6

Arizona

Hazardous Air

Pollutants

Ambient Air

Concentrations

(Acute)1

Arizona

Ambient

Air Quality

Standards2

Avg Ambient Relative Humidity (%):

Avg Wind Direction (degrees):

Avg Ambient Temperature (oC):

Avg Wind Speed (mph):

EPA

Region IX

Preliminary

Remediation

Goal3

Precipitation (inches)3

:

Date:

Arizona

Hazardous Air

Pollutants

Ambient Air

Concentrations

(Chronic)1

EPA

National

Ambient

Air Quality

Standards4 Result Percent11 Qual Result Percent11 Qual Result Percent1

31.39 NA 26.51 NA 34.04 NA 

0.9271 3.2960 0.6154 2.5910 0.9817 3.2190 

0.003 0.0000 * 0.0083 0.0351 0.0062 0.0202 

0.0147 0.0522 0.0187 0.0787 0.0076 0.0249 

0.0159 0.0564 0.0172 0.0726 0.0145 0.0474 0.0129 0.0459 0.0144 0.0607 NA NA 

0.0066 0.0236 0.0033 0.0141 0.0028 0.0091 

0.0024 0.0013 * 0.0027 0.0040 * 0.0024 0.0000 

0.8673 3.0840 0.5824 2.4520 0.7204 2.3620 0.1265 0.4498 0.0164 0.0690 0.0075 0.0211 

0.0012 0.0042 * 0.0019 0.0081 0.0012 0.0036 

0.0171 0.0000 * 0.0213 0.0000 * 0.0183 0.0000 

0.2927 1.0410 1.09 4.5910 0.5914 1.9390 

0.0012 0.0000 * 0.0015 0.0000 * 0.0012 0.0000 0.0009 0.0000 * 0.0012 0.0000 * 0.0012 0.0000 0.0027 0.0000 * 0.0027 0.0000 * 0.0027 0.0000 0.9261 3.2930 1.151 4.8470 0.9817 3.2190 0.0105 0.0000 * 0.0078 0.0000 * 0.0087 0.0000 0.0459 0.1631 0.0586 0.2468 0.0264 0.0866 

0.119 0.4230 0.0675 0.2617 * 0.0399 0.0039 

0.0142 0.0506 0.0081 0.0343 0.0111 0.0364 0.0018 0.0000 * 0.0021 0.0000 * 0.0021 0.0000 

0.004 0.0142 0.0127 0.0533 0.007 0.0228 

0.0018 0.0027 * 0.0021 0.0000 * 0.0021 0.0040 0.0021 0.0000 * 0.0024 0.0000 * 0.0024 0.0012 0.0057 0.0000 * 0.0057 0.0000 * 0.0057 0.0000 0.5405 1.9220 0.3485 1.4670 0.441 1.4460 0.0024 0.0084 0.0013 0.0054 0.0015 0.0049 0.0014 0.0050 0.0067 0.0283 0.0009 0.0009 

2.584 9.1890 1.708 7.1900 2.517 8.2530 

0.0024 0.0000 * 0.0024 0.0040 * 0.0024 0.0032 0.2386 0.8484 0.1749 0.7119 * 0.0648 0.0638 0.0061 0.0218 0.0038 0.0159 0.0045 0.0147 

0.75 2.6670 1.144 4.8150 0.6578 2.1570 

0.003 0.0027 * 0.0033 0.0008 * 0.0033 0.0062 

0.0808 0.2874 0.044 0.1852 0.0599 0.1965 0.0033 0.0000 * 0.0024 0.0000 * 0.0027 0.0000 0.0012 0.0002 * 0.0012 0.0000 * 0.0012 0.0000 0.0294 0.1046 0.049 0.2062 0.0267 0.0877 

0.0015 0.0050 * 0.0015 0.0054 * 0.0015 0.0048 

Calm: 25.00% Calm: 43.75% Calm: 16.67% 

4.47 4.97 5.47 

6/15/08 6/18/08 6/21/08

33.8 34.2 34.6 

304 293 197

NA NA NA 5.3 5.2 5.2
TABLE 2

Air Filter Sampling Laboratory Values for Inorganic ParametersWinkelman Monitoring StationData Evaluation ReportASARCO LLC Hayden, Arizona Plant Site

Parameter Units Result Percent11 Qual Result Percent11 Qual Result Percent1

PM10 μg/m3 -- -- 150 7/50 8 -- 150 7 -- 26.58 NA 17.76 NA 6.56 NA 

Aluminum μg/m3 -- -- -- 5.1 -- -- 0.646 2.7200 0.4549 2.8430 0.0931 1.5630 

Antimony μg/m3 13,000 1.46 -- -- -- -- 0.0033 0.0044 * 0.0027 0.0000 * 0.0027 0.0000 

Arsenic μg/m3 2,500 0.000441 -- 0.00045 -- 0.19 0.0073 0.0305 0.0048 0.0300 0.0012 0.0198 

Barium μg/m3 -- -- -- 0.52 -- -- 0.0095 0.0400 0.0066 0.0062 * 0.0039 0.0332 

Bismuth μg/m3 -- -- -- -- -- -- 0.0081 0.0339 NA NA NA NA 

Bromine μg/m3 -- -- -- -- -- -- 0.0032 0.0137 0.0026 0.0162 0.0009 0.0111 

Cadmium μg/m3 250 0.00105 -- 0.0011 -- -- 0.0024 0.0000 * 0.0018 0.0000 * 0.0018 0.0000 

Calcium μg/m3 -- -- -- -- -- -- 0.5174 2.1790 0.3937 2.4610 0.0845 1.4180 

Chlorine μg/m3 -- -- -- -- -- -- 0.0087 0.0365 0.0054 0.0188 * 0.0042 0.0000 

Chromium μg/m3 100 0.000158 -- 0.00016 -- -- 0.0012 0.0048 * 0.0009 0.0044 * 0.0009 0.0000 

Cobalt μg/m3 10,000 0.000686 -- 0.00069 -- -- 0.0129 0.0000 * 0.0054 0.0000 * 0.0027 0.0000 

Copper μg/m3 -- -- -- -- -- 100 0.3802 1.6010 0.0961 0.6006 0.0203 0.3406 

Gallium μg/m3 -- -- -- -- -- -- 0.0012 0.0000 * 0.0012 0.0000 * 0.0012 0.0103 

Germanium μg/m3 -- -- -- -- -- -- 0.0009 0.0000 * 0.0012 0.0000 * 0.0012 0.0087 Indium μg/m3 -- -- -- -- -- -- 0.0024 0.0000 * 0.0018 0.0012 * 0.0018 0.0000 Iron μg/m3 -- -- -- -- -- -- 0.6827 2.8750 0.3754 2.3460 0.0694 1.1640 

Lanthanum μg/m3 -- -- -- -- -- -- 0.0078 0.0000 * 0.0057 0.0024 * 0.0027 0.0119 

Lead μg/m3 -- -- 1.5 9 10 -- 1.5 9 10 -- 0.0294 0.1239 0.0141 0.0883 0.0027 0.0190 

Magnesium μg/m3 -- -- -- -- -- -- 0.0363 0.0852 * 0.0583 0.3643 0.0345 0.3580 

Manganese μg/m3 2,500 0.0521 -- 0.051 -- -- 0.0082 0.0347 0.0058 0.0362 0.0012 0.0150 

Mercury μg/m3 1,000 0.313 -- 0.31 -- 1.8 0.0018 0.0000 * 0.0021 0.0024 * 0.0021 0.0190 

Molybdenum μg/m3 -- -- -- -- -- -- 0.0044 0.0184 0.003 0.0112 * 0.0027 0.0071 

Nickel μg/m3 5,000 0.0079 -- 0.008 -- 6 0.0018 0.0036 * 0.0021 0.0000 * 0.0021 0.0000 

Palladium μg/m3 -- -- -- -- -- -- 0.0021 0.0000 * 0.0018 0.0000 * 0.0018 0.0055 

Phosphorus μg/m3 -- -- -- -- -- -- 0.0054 0.0000 * 0.0042 0.0238 * 0.003 0.0498 

Potassium μg/m3 -- -- -- -- -- -- 0.3527 1.4850 0.2431 1.5200 0.0503 0.8439 

Rubidium μg/m3 -- -- -- -- -- -- 0.0016 0.0069 0.0012 0.0074 * 0.0009 0.0000 

Selenium μg/m3 500 18.3 -- -- -- -- 0.0023 0.0095 0.0009 0.0053 * 0.0011 0.0182 

Silicon μg/m3 -- -- -- -- -- -- 1.675 7.0540 1.119 6.9920 0.2219 3.7230 Silver μg/m3 -- -- -- -- -- -- 0.0024 0.0000 * 0.0018 0.0000 * 0.0018 0.0000 

Sodium μg/m3 -- -- -- -- -- -- 0.213 0.8967 0.1509 0.7754 * 0.0357 0.2300 Strontium μg/m3 -- -- -- -- -- -- 0.0036 0.0151 0.0027 0.0168 0.0012 0.0063 

Sulfur μg/m3 -- -- -- -- -- -- 0.847 3.5660 0.6239 3.8990 0.2364 3.9680 

Tin μg/m3 -- -- -- -- -- -- 0.003 0.0042 * 0.0024 0.0000 * 0.0024 0.0024 

Titanium μg/m3 -- -- -- 31 -- -- 0.0531 0.2236 0.0446 0.2790 0.0097 0.1628 

Vanadium μg/m3 -- -- -- -- -- -- 0.0024 0.0012 * 0.0018 0.0012 * 0.0009 0.0016 

Yttrium μg/m3 -- -- -- -- -- -- 0.0012 0.0000 * 0.0015 0.0015 * 0.0015 0.0000 

Zinc μg/m3 -- -- -- -- -- -- 0.0173 0.0730 0.0134 0.0836 0.0036 0.0601 

Zirconium μg/m3 -- -- -- -- -- -- 0.0016 0.0067 0.0018 0.0077 * 0.0018 0.0000 

Table Notes:

1 Arizona Department of Environmental Quality Acute and Chronic Ambient Air Concentrations, Title 18 Chapter 2 Article 17, December 2007 2 Arizona Department of Environmental Quality Ambient Air Quality Standards, Title 18 Chapter 2 Article 2, December 2007 Wind Speed: 3 EPA Region IX Preliminary Remediation Goals, Ambient Air, October 2004 mph 4 EPA National Ambient Air Quality Standards, http://www.epa.gov/air/criteria.html, February 2008 5 California Acute Reference Exposure Levels, March 1999 6 With the exception of arsenic, the averaging time for all listed analytes is one hour. The averaging time for arsenic is four hours. 7 The averaging time for the criteria is 24 hours. 8 The averaging time for the criteria is the annual arithmetic mean. 9 The averaging time for the criteria is the quarterly average.10 Only the PM10 fraction is being measured not the total suspended particulates.11 Percent of Total Mass12 Precipitation measurements are recorded manually by a Hayden-Winkelman High School employee; reliability cannot be verified.13 Bold values with bold outline indicate the result exceeds one or more of the comparison criteria.14 Bold italicized values indicate the non-detected result exceeds one or more of the comparison criteria. Calm: < 115 * = The result is less than three times the level of uncertainty which is shown in place of the result. Wind direction16 -- = Not established toward center Calm: 4.17% Calm: 27.08% Calm: 12.50% 17 °C = Degrees Celsius18 % = Percent19 J = Estimated value20 mph = miles per hour21 NA = Not Applicable or Not Analyzed22 NPR = No precipitation recorded.23 μg/m3 = Micrograms per cubic meter24 PM10 = particulate matter with a diameter less than or equal to 10 microns in size25 R = Rejected26 This table should be considered preliminary and will be revised based on incoming data, final data validation and QA/QC.

13.7

NA

7/3/08

5.03

23

34.2

6.2NA

14.9

NA

7/6/08

5.28

7/9/08

4.78

112

29.6

3

31.3

Precipitation (inches)3

:

Avg Ambient Temperature (oC):

Avg Ambient Relative Humidity (%):

Avg Wind Direction (degrees):

Avg Wind Speed (mph):

EPA

Region IX

Preliminary

Remediation

Goal3

Date:

Arizona

Hazardous Air

Pollutants

Ambient Air

Concentrations

(Chronic)1

EPA

National

Ambient

Air Quality

Standards4

California

Acute

Reference

Exposure

Levels5 6

Arizona

Hazardous Air

Pollutants

Ambient Air

Concentrations

(Acute)1

Arizona

Ambient

Air Quality

Standards2
TABLE 2

Air Filter Sampling Laboratory Values for Inorganic ParametersWinkelman Monitoring StationData Evaluation ReportASARCO LLC Hayden, Arizona Plant Site

Parameter Units

PM10 μg/m3 -- -- 150 7/50 8 -- 150 7 --

Aluminum μg/m3 -- -- -- 5.1 -- --

Antimony μg/m3 13,000 1.46 -- -- -- --

Arsenic μg/m3 2,500 0.000441 -- 0.00045 -- 0.19

Barium μg/m3 -- -- -- 0.52 -- --

Bismuth μg/m3 -- -- -- -- -- --Bromine μg/m3 -- -- -- -- -- --Cadmium μg/m3 250 0.00105 -- 0.0011 -- --

Calcium μg/m3 -- -- -- -- -- --

Chlorine μg/m3 -- -- -- -- -- --Chromium μg/m3 100 0.000158 -- 0.00016 -- --Cobalt μg/m3 10,000 0.000686 -- 0.00069 -- --

Copper μg/m3 -- -- -- -- -- 100

Gallium μg/m3 -- -- -- -- -- --Germanium μg/m3 -- -- -- -- -- --Indium μg/m3 -- -- -- -- -- --Iron μg/m3 -- -- -- -- -- --Lanthanum μg/m3 -- -- -- -- -- --Lead μg/m3 -- -- 1.5 9 10 -- 1.5 9 10 --

Magnesium μg/m3 -- -- -- -- -- --

Manganese μg/m3 2,500 0.0521 -- 0.051 -- --

Mercury μg/m3 1,000 0.313 -- 0.31 -- 1.8

Molybdenum μg/m3 -- -- -- -- -- --

Nickel μg/m3 5,000 0.0079 -- 0.008 -- 6

Palladium μg/m3 -- -- -- -- -- --

Phosphorus μg/m3 -- -- -- -- -- --Potassium μg/m3 -- -- -- -- -- --Rubidium μg/m3 -- -- -- -- -- --Selenium μg/m3 500 18.3 -- -- -- --

Silicon μg/m3 -- -- -- -- -- --

Silver μg/m3 -- -- -- -- -- --Sodium μg/m3 -- -- -- -- -- --Strontium μg/m3 -- -- -- -- -- --Sulfur μg/m3 -- -- -- -- -- --Tin μg/m3 -- -- -- -- -- --Titanium μg/m3 -- -- -- 31 -- --Vanadium μg/m3 -- -- -- -- -- --Yttrium μg/m3 -- -- -- -- -- --Zinc μg/m3 -- -- -- -- -- --Zirconium μg/m3 -- -- -- -- -- --

Table Notes:

1 Arizona Department of Environmental Quality Acute and Chronic Ambient Air Concentrations, Title 18 Chapter 2 Article 17, December 2007 2 Arizona Department of Environmental Quality Ambient Air Quality Standards, Title 18 Chapter 2 Article 2, December 2007 Wind Speed: 3 EPA Region IX Preliminary Remediation Goals, Ambient Air, October 2004 mph 4 EPA National Ambient Air Quality Standards, http://www.epa.gov/air/criteria.html, February 2008 5 California Acute Reference Exposure Levels, March 1999 6 With the exception of arsenic, the averaging time for all listed analytes is one hour. The averaging time for arsenic is four hours. 7 The averaging time for the criteria is 24 hours. 8 The averaging time for the criteria is the annual arithmetic mean. 9 The averaging time for the criteria is the quarterly average.10 Only the PM10 fraction is being measured not the total suspended particulates.11 Percent of Total Mass12 Precipitation measurements are recorded manually by a Hayden-Winkelman High School employee; reliability cannot be verified.13 Bold values with bold outline indicate the result exceeds one or more of the comparison criteria.14 Bold italicized values indicate the non-detected result exceeds one or more of the comparison criteria. Calm: < 115 * = The result is less than three times the level of uncertainty which is shown in place of the result. Wind direction16 -- = Not established toward center17 °C = Degrees Celsius18 % = Percent19 J = Estimated value20 mph = miles per hour21 NA = Not Applicable or Not Analyzed22 NPR = No precipitation recorded.23 μg/m3 = Micrograms per cubic meter24 PM10 = particulate matter with a diameter less than or equal to 10 microns in size25 R = Rejected26 This table should be considered preliminary and will be revised based on incoming data, final data validation and QA/QC.

Precipitation (inches)3

:

Avg Ambient Temperature (oC):

Avg Ambient Relative Humidity (%):

Avg Wind Direction (degrees):

Avg Wind Speed (mph):

EPA

Region IX

Preliminary

Remediation

Goal3

Date:

Arizona

Hazardous Air

Pollutants

Ambient Air

Concentrations

(Chronic)1

EPA

National

Ambient

Air Quality

Standards4

California

Acute

Reference

Exposure

Levels5 6

Arizona

Hazardous Air

Pollutants

Ambient Air

Concentrations

(Acute)1

Arizona

Ambient

Air Quality

Standards2 Result Percent11 Qual Result Percent11 Qual Result Percent1

12.61 NA 19.92 NA 19.42 NA 

0.1904 1.6730 0.4661 2.5840 0.5457 3.1110 0.0027 0.0149 * 0.0024 0.0021 * 0.0027 0.0072 0.0162 0.1428 0.0028 0.0154 0.0065 0.0368 

0.0051 0.0000 * 0.0063 0.0000 * 0.0066 0.0319 0.0292 0.2570 NA NA NA NA 0.0009 0.0075 * 0.0027 0.0149 0.0033 0.0191 

0.0018 0.0116 * 0.0018 0.0000 * 0.0018 0.0000 

0.2364 2.0780 0.3503 1.9410 0.5306 3.0250 0.0054 0.0000 * 0.3026 1.6770 0.2089 1.1910 

0.0009 0.0000 * 0.0009 0.0000 * 0.0009 0.0030 

0.0048 0.0000 * 0.0054 0.0000 * 0.0069 0.0000 

0.2857 2.5110 0.0864 0.4786 0.2668 1.5210 

0.0015 0.0000 * 0.0012 0.0000 * 0.0015 0.0000 0.0012 0.0000 * 0.0012 0.0000 * 0.0012 0.0000 0.0018 0.0000 * 0.0018 0.0000 * 0.0018 0.0000 0.3227 2.8370 0.3816 2.1150 0.5047 2.8770 0.0045 0.0000 * 0.0054 0.0037 * 0.0054 0.0000 0.0721 0.6337 0.0089 0.0493 0.0261 0.1490 

0.0195 0.0799 * 0.112 0.6206 0.0926 0.5280 0.0032 0.0281 0.0075 0.0415 0.0079 0.0448 

0.0021 0.0000 * 0.0021 0.0000 * 0.0021 0.0000 0.0078 0.0687 0.0027 0.0112 * 0.0034 0.0196 0.0021 0.0050 * 0.0021 0.0089 * 0.0024 0.0113 0.0018 0.0021 * 0.0018 0.0005 * 0.0018 0.0000 0.0039 0.0248 * 0.0039 0.0000 * 0.0039 0.0000 0.1106 0.9723 0.2759 1.5290 0.2664 1.5180 0.0009 0.0079 * 0.0009 0.0039 * 0.0016 0.0094 

0.007 0.0617 0.0009 0.0023 * 0.0009 0.0056 

0.5222 4.5900 1.286 7.1300 1.451 8.2720 0.0018 0.0058 * 0.0018 0.0000 * 0.0018 0.0000 0.0444 0.0000 * 0.5867 3.2520 0.3071 1.7510 0.0018 0.0161 0.0031 0.0172 0.006 0.0344 0.7915 6.9580 0.7985 4.4260 0.5363 3.0570 0.0041 0.0360 0.0027 0.0057 * 0.0027 0.0140 0.0266 0.2335 0.0341 0.1892 0.039 0.2225 0.0012 0.0000 * 0.0024 0.0136 0.0018 0.0008 0.0015 0.0075 * 0.0015 0.0050 * 0.0015 0.0038 0.0412 0.3622 0.0051 0.0284 0.0178 0.1015 0.0018 0.0145 * 0.0018 0.0042 * 0.0018 0.0046 

Calm: 8.33% Calm: 18.75% Calm: 39.58% 

7/24/08

3.60

194

32.111.6

NA NA

7/30/08

3.98

294

31.7

6.7NA

7/27/08

5.16

298

7.9

31.8
TABLE 2

Air Filter Sampling Laboratory Values for Inorganic ParametersWinkelman Monitoring StationData Evaluation ReportASARCO LLC Hayden, Arizona Plant Site

Parameter Units

PM10 μg/m3 -- -- 150 7/50 8 -- 150 7 --

Aluminum μg/m3 -- -- -- 5.1 -- --

Antimony μg/m3 13,000 1.46 -- -- -- --

Arsenic μg/m3 2,500 0.000441 -- 0.00045 -- 0.19

Barium μg/m3 -- -- -- 0.52 -- --

Bismuth μg/m3 -- -- -- -- -- --Bromine μg/m3 -- -- -- -- -- --Cadmium μg/m3 250 0.00105 -- 0.0011 -- --

Calcium μg/m3 -- -- -- -- -- --

Chlorine μg/m3 -- -- -- -- -- --Chromium μg/m3 100 0.000158 -- 0.00016 -- --Cobalt μg/m3 10,000 0.000686 -- 0.00069 -- --

Copper μg/m3 -- -- -- -- -- 100

Gallium μg/m3 -- -- -- -- -- --Germanium μg/m3 -- -- -- -- -- --Indium μg/m3 -- -- -- -- -- --Iron μg/m3 -- -- -- -- -- --Lanthanum μg/m3 -- -- -- -- -- --Lead μg/m3 -- -- 1.5 9 10 -- 1.5 9 10 --

Magnesium μg/m3 -- -- -- -- -- --

Manganese μg/m3 2,500 0.0521 -- 0.051 -- --

Mercury μg/m3 1,000 0.313 -- 0.31 -- 1.8

Molybdenum μg/m3 -- -- -- -- -- --

Nickel μg/m3 5,000 0.0079 -- 0.008 -- 6

Palladium μg/m3 -- -- -- -- -- --

Phosphorus μg/m3 -- -- -- -- -- --Potassium μg/m3 -- -- -- -- -- --Rubidium μg/m3 -- -- -- -- -- --Selenium μg/m3 500 18.3 -- -- -- --

Silicon μg/m3 -- -- -- -- -- --

Silver μg/m3 -- -- -- -- -- --Sodium μg/m3 -- -- -- -- -- --Strontium μg/m3 -- -- -- -- -- --Sulfur μg/m3 -- -- -- -- -- --Tin μg/m3 -- -- -- -- -- --Titanium μg/m3 -- -- -- 31 -- --Vanadium μg/m3 -- -- -- -- -- --Yttrium μg/m3 -- -- -- -- -- --Zinc μg/m3 -- -- -- -- -- --Zirconium μg/m3 -- -- -- -- -- --

Table Notes:

1 Arizona Department of Environmental Quality Acute and Chronic Ambient Air Concentrations, Title 18 Chapter 2 Article 17, December 2007 2 Arizona Department of Environmental Quality Ambient Air Quality Standards, Title 18 Chapter 2 Article 2, December 2007 Wind Speed: 3 EPA Region IX Preliminary Remediation Goals, Ambient Air, October 2004 mph 4 EPA National Ambient Air Quality Standards, http://www.epa.gov/air/criteria.html, February 2008 5 California Acute Reference Exposure Levels, March 1999 6 With the exception of arsenic, the averaging time for all listed analytes is one hour. The averaging time for arsenic is four hours. 7 The averaging time for the criteria is 24 hours. 8 The averaging time for the criteria is the annual arithmetic mean. 9 The averaging time for the criteria is the quarterly average.10 Only the PM10 fraction is being measured not the total suspended particulates.11 Percent of Total Mass12 Precipitation measurements are recorded manually by a Hayden-Winkelman High School employee; reliability cannot be verified.13 Bold values with bold outline indicate the result exceeds one or more of the comparison criteria.14 Bold italicized values indicate the non-detected result exceeds one or more of the comparison criteria. Calm: < 115 * = The result is less than three times the level of uncertainty which is shown in place of the result. Wind direction16 -- = Not established toward center17 °C = Degrees Celsius18 % = Percent19 J = Estimated value20 mph = miles per hour21 NA = Not Applicable or Not Analyzed22 NPR = No precipitation recorded.23 μg/m3 = Micrograms per cubic meter24 PM10 = particulate matter with a diameter less than or equal to 10 microns in size25 R = Rejected26 This table should be considered preliminary and will be revised based on incoming data, final data validation and QA/QC.

Precipitation (inches)3

:

Avg Ambient Temperature (oC):

Avg Ambient Relative Humidity (%):

Avg Wind Direction (degrees):

Avg Wind Speed (mph):

EPA

Region IX

Preliminary

Remediation

Goal3

Date:

Arizona

Hazardous Air

Pollutants

Ambient Air

Concentrations

(Chronic)1

EPA

National

Ambient

Air Quality

Standards4

California

Acute

Reference

Exposure

Levels5 6

Arizona

Hazardous Air

Pollutants

Ambient Air

Concentrations

(Acute)1

Arizona

Ambient

Air Quality

Standards2 Result Percent11 Qual Result Percent11 Qual Result Percent1

21.24 NA 8.61 NA 14.71 NA 

0.5287 2.7710 0.0961 1.2210 0.2171 1.6290 

0.0168 0.0878 0.0133 0.1686 0.0113 0.0851 0.0084 0.0442 0.0062 0.0789 0.0149 0.1116 

0.0094 0.0493 0.0048 0.0251 * 0.0048 0.0007 

NA NA NA NA 0.0166 0.1247 

0.0023 0.0121 0.0009 0.0066 * 0.0011 0.0085 0.0024 0.0000 * 0.0024 0.0000 * 0.0024 0.0039 0.5273 2.7630 0.1046 1.3280 0.1404 1.0530 

0.014 0.0735 0.0066 0.0042 * 0.0081 0.0053 

0.0012 0.0000 * 0.0012 0.0000 * 0.0012 0.0000 0.0105 0.0000 * 0.0042 0.0000 * 0.0054 0.0000 0.2828 1.4820 0.1613 2.0480 0.1783 1.3370 0.0015 0.0000 * 0.0015 0.0000 * 0.0015 0.0000 0.0012 0.0000 * 0.0012 0.0000 * 0.0012 0.0000 0.0027 0.0000 * 0.0027 0.0000 * 0.0027 0.0060 0.5603 2.9360 0.1415 1.7970 0.2366 1.7740 0.0084 0.0000 * 0.0051 0.0000 * 0.0048 0.0000 0.0354 0.1855 0.0266 0.3378 0.053 0.3973 

0.062 0.3249 0.021 0.1004 * 0.0252 0.0099 

0.0067 0.0353 0.0017 0.0215 0.0025 0.0187 0.0021 0.0000 * 0.0021 0.0000 * 0.0021 0.0000 0.0034 0.0180 0.0024 0.0066 * 0.0034 0.0258 

0.0021 0.0020 * 0.0021 0.0155 * 0.0026 0.0194 

0.0024 0.0000 * 0.0024 0.0000 * 0.0024 0.0000 0.0051 0.0000 * 0.0039 0.0000 * 0.0045 0.0000 0.2783 1.4580 0.0807 1.0240 0.1385 1.0390 0.0009 0.0049 * 0.0009 0.0000 * 0.0009 0.0046 0.0014 0.0074 0.0025 0.0317 0.0036 0.0268 

1.404 7.3550 0.2751 3.4930 0.678 5.0850 

0.0024 0.0000 * 0.0024 0.0000 * 0.0024 0.0000 0.2688 1.4090 0.0396 0.0132 * 0.1191 0.8870 0.0046 0.0242 0.0009 0.0066 * 0.0009 0.0064 0.8103 4.2460 0.3603 4.5750 0.7091 5.3180 0.0036 0.0047 * 0.0033 0.0078 * 0.0036 0.0148 0.0665 0.3486 0.0179 0.2272 0.0148 0.1109 0.0024 0.0101 * 0.0012 0.0036 * 0.0012 0.0000 0.0012 0.0000 * 0.0012 0.0000 * 0.0012 0.0000 0.0218 0.1142 0.0131 0.1668 0.0294 0.2204 0.0019 0.0101 0.0015 0.0042 * 0.0015 0.0042 

7.8NA

20.9

NA

8/11/08

4.47

8/14/08

4.10

168

28.4

307

33.0

8/17/08

4.72

308

30.7

9.1NA
TABLE 2

Air Filter Sampling Laboratory Values for Inorganic ParametersWinkelman Monitoring StationData Evaluation ReportASARCO LLC Hayden, Arizona Plant Site

Parameter Units

PM10 μg/m3 -- -- 150 7/50 8 -- 150 7 --

Aluminum μg/m3 -- -- -- 5.1 -- --

Antimony μg/m3 13,000 1.46 -- -- -- --

Arsenic μg/m3 2,500 0.000441 -- 0.00045 -- 0.19

Barium μg/m3 -- -- -- 0.52 -- --

Bismuth μg/m3 -- -- -- -- -- --Bromine μg/m3 -- -- -- -- -- --Cadmium μg/m3 250 0.00105 -- 0.0011 -- --

Calcium μg/m3 -- -- -- -- -- --

Chlorine μg/m3 -- -- -- -- -- --Chromium μg/m3 100 0.000158 -- 0.00016 -- --Cobalt μg/m3 10,000 0.000686 -- 0.00069 -- --

Copper μg/m3 -- -- -- -- -- 100

Gallium μg/m3 -- -- -- -- -- --Germanium μg/m3 -- -- -- -- -- --Indium μg/m3 -- -- -- -- -- --Iron μg/m3 -- -- -- -- -- --Lanthanum μg/m3 -- -- -- -- -- --Lead μg/m3 -- -- 1.5 9 10 -- 1.5 9 10 --

Magnesium μg/m3 -- -- -- -- -- --

Manganese μg/m3 2,500 0.0521 -- 0.051 -- --

Mercury μg/m3 1,000 0.313 -- 0.31 -- 1.8

Molybdenum μg/m3 -- -- -- -- -- --

Nickel μg/m3 5,000 0.0079 -- 0.008 -- 6

Palladium μg/m3 -- -- -- -- -- --

Phosphorus μg/m3 -- -- -- -- -- --Potassium μg/m3 -- -- -- -- -- --Rubidium μg/m3 -- -- -- -- -- --Selenium μg/m3 500 18.3 -- -- -- --

Silicon μg/m3 -- -- -- -- -- --

Silver μg/m3 -- -- -- -- -- --Sodium μg/m3 -- -- -- -- -- --Strontium μg/m3 -- -- -- -- -- --Sulfur μg/m3 -- -- -- -- -- --Tin μg/m3 -- -- -- -- -- --Titanium μg/m3 -- -- -- 31 -- --Vanadium μg/m3 -- -- -- -- -- --Yttrium μg/m3 -- -- -- -- -- --Zinc μg/m3 -- -- -- -- -- --Zirconium μg/m3 -- -- -- -- -- --

Table Notes:

1 Arizona Department of Environmental Quality Acute and Chronic Ambient Air Concentrations, Title 18 Chapter 2 Article 17, December 2007 2 Arizona Department of Environmental Quality Ambient Air Quality Standards, Title 18 Chapter 2 Article 2, December 2007 Wind Speed: 3 EPA Region IX Preliminary Remediation Goals, Ambient Air, October 2004 mph 4 EPA National Ambient Air Quality Standards, http://www.epa.gov/air/criteria.html, February 2008 5 California Acute Reference Exposure Levels, March 1999 6 With the exception of arsenic, the averaging time for all listed analytes is one hour. The averaging time for arsenic is four hours. 7 The averaging time for the criteria is 24 hours. 8 The averaging time for the criteria is the annual arithmetic mean. 9 The averaging time for the criteria is the quarterly average.10 Only the PM10 fraction is being measured not the total suspended particulates.11 Percent of Total Mass12 Precipitation measurements are recorded manually by a Hayden-Winkelman High School employee; reliability cannot be verified.13 Bold values with bold outline indicate the result exceeds one or more of the comparison criteria.14 Bold italicized values indicate the non-detected result exceeds one or more of the comparison criteria. Calm: < 115 * = The result is less than three times the level of uncertainty which is shown in place of the result. Wind direction16 -- = Not established toward center17 °C = Degrees Celsius18 % = Percent19 J = Estimated value20 mph = miles per hour21 NA = Not Applicable or Not Analyzed22 NPR = No precipitation recorded.23 μg/m3 = Micrograms per cubic meter24 PM10 = particulate matter with a diameter less than or equal to 10 microns in size25 R = Rejected26 This table should be considered preliminary and will be revised based on incoming data, final data validation and QA/QC.

Precipitation (inches)3

:

Avg Ambient Temperature (oC):

Avg Ambient Relative Humidity (%):

Avg Wind Direction (degrees):

Avg Wind Speed (mph):

EPA

Region IX

Preliminary

Remediation

Goal3

Date:

Arizona

Hazardous Air

Pollutants

Ambient Air

Concentrations

(Chronic)1

EPA

National

Ambient

Air Quality

Standards4

California

Acute

Reference

Exposure

Levels5 6

Arizona

Hazardous Air

Pollutants

Ambient Air

Concentrations

(Acute)1

Arizona

Ambient

Air Quality

Standards2 Result Percent11 Qual Result Percent11 Qual Result Percent1

9.2 NA 16.02 NA 10.13 NA 

0.0644 0.7647 0.3445 2.3690 0.2043 2.2290 

0.0027 0.0062 * 0.0033 0.0000 * 0.003 0.0000 0.0082 0.0973 0.0099 0.0680 0.0027 0.0288 

0.0024 0.0000 * 0.0045 0.0000 * 0.003 0.0000 

NA NA NA NA NA NA 

0.0009 0.0022 * 0.0021 0.0146 0.0012 0.0128 0.0018 0.0000 * 0.0021 0.0065 * 0.0021 0.0087 0.0583 0.6931 0.3074 2.1140 0.1848 2.0170 0.0039 0.0056 * 0.0051 0.0330 * 0.0042 0.0000 0.0006 0.0000 * 0.0009 0.0029 * 0.0009 0.0000 0.0024 0.0000 * 0.0051 0.0000 * 0.0033 0.0000 

0.035 0.4162 0.1201 0.8256 0.0319 0.3477 

0.0015 0.0000 * 0.0021 0.0000 * 0.0018 0.0000 0.0012 0.0000 * 0.0015 0.0000 * 0.0015 0.0000 0.0018 0.0000 * 0.0021 0.0000 * 0.0021 0.0000 0.0742 0.8811 0.335 2.3040 0.1482 1.6160 0.0021 0.0117 * 0.0048 0.0042 * 0.0033 0.0154 0.0153 0.1824 0.0163 0.1120 0.0067 0.0734 0.0318 0.2747 * 0.0636 0.4374 0.0428 0.4664 0.0013 0.0151 0.004 0.0272 0.0023 0.0252 0.0024 0.0000 * 0.003 0.0000 * 0.0027 0.0010 

0.003 0.0207 * 0.0036 0.0155 * 0.0033 0.0000 

0.0024 0.0034 * 0.0033 0.0133 * 0.003 0.0170 0.0021 0.0000 * 0.0024 0.0062 * 0.0024 0.0000 0.0049 0.0582 0.0036 0.0217 * 0.0027 0.0077 

0.057 0.6774 0.164 1.1280 0.0958 1.0450 

0.0012 0.0022 * 0.0015 0.0000 * 0.0015 0.0036 0.0012 0.0101 * 0.0012 0.0071 * 0.0012 0.0046 0.2029 2.4100 1.066 7.3300 0.5363 5.8500 0.0018 0.0000 * 0.0021 0.0000 * 0.0021 0.0005 0.0936 0.5359 * 0.0411 0.1415 * 0.0345 0.1762 0.0015 0.0067 * 0.0027 0.0185 0.0018 0.0118 0.5217 6.1980 0.7095 4.8790 0.5306 5.7890 0.0024 0.0000 * 0.003 0.0130 * 0.0027 0.0010 0.0071 0.0839 0.0353 0.2428 0.0151 0.1644 0.0006 0.0000 * 0.0015 0.0000 * 0.0009 0.0000 0.0018 0.0000 * 0.0021 0.0084 * 0.0021 0.0092 0.0106 0.1259 0.0114 0.0787 0.0056 0.0616 0.0021 0.0067 * 0.0027 0.0091 * 0.0024 0.0000 

9/1/08

2.61

249

27.4

6.5NA

9/4/08

2.61

208

29.9

23.2

NA

11.1

NA

9/7/08

3.60

120

30.2
TABLE 2

Air Filter Sampling Laboratory Values for Inorganic ParametersWinkelman Monitoring StationData Evaluation ReportASARCO LLC Hayden, Arizona Plant Site

Parameter Units

PM10 μg/m3 -- -- 150 7/50 8 -- 150 7 --

Aluminum μg/m3 -- -- -- 5.1 -- --

Antimony μg/m3 13,000 1.46 -- -- -- --

Arsenic μg/m3 2,500 0.000441 -- 0.00045 -- 0.19

Barium μg/m3 -- -- -- 0.52 -- --

Bismuth μg/m3 -- -- -- -- -- --Bromine μg/m3 -- -- -- -- -- --Cadmium μg/m3 250 0.00105 -- 0.0011 -- --

Calcium μg/m3 -- -- -- -- -- --

Chlorine μg/m3 -- -- -- -- -- --Chromium μg/m3 100 0.000158 -- 0.00016 -- --Cobalt μg/m3 10,000 0.000686 -- 0.00069 -- --

Copper μg/m3 -- -- -- -- -- 100

Gallium μg/m3 -- -- -- -- -- --Germanium μg/m3 -- -- -- -- -- --Indium μg/m3 -- -- -- -- -- --Iron μg/m3 -- -- -- -- -- --Lanthanum μg/m3 -- -- -- -- -- --Lead μg/m3 -- -- 1.5 9 10 -- 1.5 9 10 --

Magnesium μg/m3 -- -- -- -- -- --

Manganese μg/m3 2,500 0.0521 -- 0.051 -- --

Mercury μg/m3 1,000 0.313 -- 0.31 -- 1.8

Molybdenum μg/m3 -- -- -- -- -- --

Nickel μg/m3 5,000 0.0079 -- 0.008 -- 6

Palladium μg/m3 -- -- -- -- -- --

Phosphorus μg/m3 -- -- -- -- -- --Potassium μg/m3 -- -- -- -- -- --Rubidium μg/m3 -- -- -- -- -- --Selenium μg/m3 500 18.3 -- -- -- --

Silicon μg/m3 -- -- -- -- -- --

Silver μg/m3 -- -- -- -- -- --Sodium μg/m3 -- -- -- -- -- --Strontium μg/m3 -- -- -- -- -- --Sulfur μg/m3 -- -- -- -- -- --Tin μg/m3 -- -- -- -- -- --Titanium μg/m3 -- -- -- 31 -- --Vanadium μg/m3 -- -- -- -- -- --Yttrium μg/m3 -- -- -- -- -- --Zinc μg/m3 -- -- -- -- -- --Zirconium μg/m3 -- -- -- -- -- --

Table Notes:

1 Arizona Department of Environmental Quality Acute and Chronic Ambient Air Concentrations, Title 18 Chapter 2 Article 17, December 2007 2 Arizona Department of Environmental Quality Ambient Air Quality Standards, Title 18 Chapter 2 Article 2, December 2007 Wind Speed: 3 EPA Region IX Preliminary Remediation Goals, Ambient Air, October 2004 mph 4 EPA National Ambient Air Quality Standards, http://www.epa.gov/air/criteria.html, February 2008 5 California Acute Reference Exposure Levels, March 1999 6 With the exception of arsenic, the averaging time for all listed analytes is one hour. The averaging time for arsenic is four hours. 7 The averaging time for the criteria is 24 hours. 8 The averaging time for the criteria is the annual arithmetic mean. 9 The averaging time for the criteria is the quarterly average.10 Only the PM10 fraction is being measured not the total suspended particulates.11 Percent of Total Mass12 Precipitation measurements are recorded manually by a Hayden-Winkelman High School employee; reliability cannot be verified.13 Bold values with bold outline indicate the result exceeds one or more of the comparison criteria.14 Bold italicized values indicate the non-detected result exceeds one or more of the comparison criteria. Calm: < 115 * = The result is less than three times the level of uncertainty which is shown in place of the result. Wind direction16 -- = Not established toward center17 °C = Degrees Celsius18 % = Percent19 J = Estimated value20 mph = miles per hour21 NA = Not Applicable or Not Analyzed22 NPR = No precipitation recorded.23 μg/m3 = Micrograms per cubic meter24 PM10 = particulate matter with a diameter less than or equal to 10 microns in size25 R = Rejected26 This table should be considered preliminary and will be revised based on incoming data, final data validation and QA/QC.

Precipitation (inches)3

:

Avg Ambient Temperature (oC):

Avg Ambient Relative Humidity (%):

Avg Wind Direction (degrees):

Avg Wind Speed (mph):

EPA

Region IX

Preliminary

Remediation

Goal3

Date:

Arizona

Hazardous Air

Pollutants

Ambient Air

Concentrations

(Chronic)1

EPA

National

Ambient

Air Quality

Standards4

California

Acute

Reference

Exposure

Levels5 6

Arizona

Hazardous Air

Pollutants

Ambient Air

Concentrations

(Acute)1

Arizona

Ambient

Air Quality

Standards2 Result Percent11 Qual Result Percent11 Qual Result Percent1

19.94 NA 17.35 NA R NA 

0.1862 1.0220 0.6427 3.9650 R R 

0.003 0.0000 * 0.0033 0.0000 * R R 

0.0012 0.0000 * 0.0137 0.0848 R R 

0.0033 0.0044 * 0.0048 0.0032 * R R 

NA NA NA NA R R 

0.0024 0.0132 0.0016 0.0099 R R 0.0021 0.0016 * 0.0021 0.0029 * R R 0.4447 2.4420 0.5787 3.5700 R R 0.0063 0.0000 * 0.011 0.0680 R R 

0.0009 0.0000 * 0.0009 0.0032 * R R 0.0033 0.0000 * 0.0057 0.0000 * R R 0.0153 0.0843 0.0463 0.2856 R R 

0.0018 0.0000 * 0.0021 0.0003 * R R 

0.0012 0.0008 * 0.0015 0.0000 * R R 0.0021 0.0000 * 0.0021 0.0000 * R R 0.1581 0.8681 0.3927 2.4230 R R 

0.0036 0.0010 * 0.0051 0.0000 * R R 

0.0033 0.0114 * 0.0201 0.1237 R R 

0.0426 0.1895 * 0.1218 0.7515 R R 

0.0033 0.0181 0.0052 0.0322 R R 

0.0027 0.0052 * 0.003 0.0000 * R R 

0.003 0.0026 * 0.0036 0.0102 * R R 

0.0027 0.0054 * 0.0033 0.0128 * R R 0.0021 0.0034 * 0.0024 0.0000 * R R 0.0039 0.0000 * 0.0033 0.0105 * R R 

0.124 0.6808 0.2235 1.3790 R R 

0.0012 0.0041 * 0.0015 0.0055 * R R 0.0012 0.0039 * 0.0015 0.0058 * R R 0.6121 3.3620 1.7 10.4900 R R 0.0021 0.0018 * 0.0024 0.0003 * R R 

0.042 0.0864 * 0.1314 0.7044 * R R 

0.0025 0.0137 0.0038 0.0235 R R 

1.755 9.6370 0.4013 2.4760 R R 0.003 0.0163 0.003 0.0171 * R R 

0.0175 0.0959 0.037 0.2280 R R 0.0009 0.0000 * 0.0015 0.0000 * R R 0.0018 0.0072 * 0.0021 0.0000 * R R 0.0045 0.0246 0.0277 0.1711 R R 

0.0024 0.0052 * 0.0027 0.0102 * R R 

Calm: 0.00% Calm: 20.83% Calm: 25.00 

5.7NA

9.1NA

9/30/08

7.21

10/6/08

2.55

117

22.5

83

30.2

10/13/08

2.98

283

14.3

7.7NA
TABLE 2

Air Filter Sampling Laboratory Values for Inorganic ParametersWinkelman Monitoring StationData Evaluation ReportASARCO LLC Hayden, Arizona Plant Site

Parameter Units

PM10 μg/m3 -- -- 150 7/50 8 -- 150 7 --

Aluminum μg/m3 -- -- -- 5.1 -- --

Antimony μg/m3 13,000 1.46 -- -- -- --

Arsenic μg/m3 2,500 0.000441 -- 0.00045 -- 0.19

Barium μg/m3 -- -- -- 0.52 -- --

Bismuth μg/m3 -- -- -- -- -- --Bromine μg/m3 -- -- -- -- -- --Cadmium μg/m3 250 0.00105 -- 0.0011 -- --

Calcium μg/m3 -- -- -- -- -- --

Chlorine μg/m3 -- -- -- -- -- --Chromium μg/m3 100 0.000158 -- 0.00016 -- --Cobalt μg/m3 10,000 0.000686 -- 0.00069 -- --

Copper μg/m3 -- -- -- -- -- 100

Gallium μg/m3 -- -- -- -- -- --Germanium μg/m3 -- -- -- -- -- --Indium μg/m3 -- -- -- -- -- --Iron μg/m3 -- -- -- -- -- --Lanthanum μg/m3 -- -- -- -- -- --Lead μg/m3 -- -- 1.5 9 10 -- 1.5 9 10 --

Magnesium μg/m3 -- -- -- -- -- --

Manganese μg/m3 2,500 0.0521 -- 0.051 -- --

Mercury μg/m3 1,000 0.313 -- 0.31 -- 1.8

Molybdenum μg/m3 -- -- -- -- -- --

Nickel μg/m3 5,000 0.0079 -- 0.008 -- 6

Palladium μg/m3 -- -- -- -- -- --

Phosphorus μg/m3 -- -- -- -- -- --Potassium μg/m3 -- -- -- -- -- --Rubidium μg/m3 -- -- -- -- -- --Selenium μg/m3 500 18.3 -- -- -- --

Silicon μg/m3 -- -- -- -- -- --

Silver μg/m3 -- -- -- -- -- --Sodium μg/m3 -- -- -- -- -- --Strontium μg/m3 -- -- -- -- -- --Sulfur μg/m3 -- -- -- -- -- --Tin μg/m3 -- -- -- -- -- --Titanium μg/m3 -- -- -- 31 -- --Vanadium μg/m3 -- -- -- -- -- --Yttrium μg/m3 -- -- -- -- -- --Zinc μg/m3 -- -- -- -- -- --Zirconium μg/m3 -- -- -- -- -- --

Table Notes:

1 Arizona Department of Environmental Quality Acute and Chronic Ambient Air Concentrations, Title 18 Chapter 2 Article 17, December 2007 2 Arizona Department of Environmental Quality Ambient Air Quality Standards, Title 18 Chapter 2 Article 2, December 2007 Wind Speed: 3 EPA Region IX Preliminary Remediation Goals, Ambient Air, October 2004 mph 4 EPA National Ambient Air Quality Standards, http://www.epa.gov/air/criteria.html, February 2008 5 California Acute Reference Exposure Levels, March 1999 6 With the exception of arsenic, the averaging time for all listed analytes is one hour. The averaging time for arsenic is four hours. 7 The averaging time for the criteria is 24 hours. 8 The averaging time for the criteria is the annual arithmetic mean. 9 The averaging time for the criteria is the quarterly average.10 Only the PM10 fraction is being measured not the total suspended particulates.11 Percent of Total Mass12 Precipitation measurements are recorded manually by a Hayden-Winkelman High School employee; reliability cannot be verified.13 Bold values with bold outline indicate the result exceeds one or more of the comparison criteria.14 Bold italicized values indicate the non-detected result exceeds one or more of the comparison criteria. Calm: < 115 * = The result is less than three times the level of uncertainty which is shown in place of the result. Wind direction16 -- = Not established toward center17 °C = Degrees Celsius18 % = Percent19 J = Estimated value20 mph = miles per hour21 NA = Not Applicable or Not Analyzed22 NPR = No precipitation recorded.23 μg/m3 = Micrograms per cubic meter24 PM10 = particulate matter with a diameter less than or equal to 10 microns in size25 R = Rejected26 This table should be considered preliminary and will be revised based on incoming data, final data validation and QA/QC.

Precipitation (inches)3

:

Avg Ambient Temperature (oC):

Avg Ambient Relative Humidity (%):

Avg Wind Direction (degrees):

Avg Wind Speed (mph):

EPA

Region IX

Preliminary

Remediation

Goal3

Date:

Arizona

Hazardous Air

Pollutants

Ambient Air

Concentrations

(Chronic)1

EPA

National

Ambient

Air Quality

Standards4

California

Acute

Reference

Exposure

Levels5 6

Arizona

Hazardous Air

Pollutants

Ambient Air

Concentrations

(Acute)1

Arizona

Ambient

Air Quality

Standards2 Result Percent11 Qual Result Percent11 Qual Result Percent1

17.34 NA 19.02 NA 20.63 NA 

0.4755 2.9040 0.4699 2.6470 0.581 2.9990 

0.003 0.0023 * 0.003 0.0008 * 0.0033 0.0017 

0.0098 0.0601 0.0024 0.0053 * 0.0179 0.0926 

0.0045 0.0078 * 0.0042 0.0069 * 0.0054 0.0277 

NA NA NA NA 0.0302 0.1558 

0.0012 0.0060 * 0.0028 0.0157 0.0023 0.0117 

0.0021 0.0006 * 0.0021 0.0000 * 0.0021 0.0097 0.4038 2.4660 0.7872 4.4350 0.5706 2.9450 0.0048 0.0227 * 0.0058 0.0329 0.0057 0.0044 

0.0009 0.0000 * 0.0009 0.0029 * 0.0009 0.0036 

0.0054 0.0000 * 0.0048 0.0000 * 0.0069 0.0000 0.1315 0.8031 0.0326 0.1838 0.3796 1.9590 

0.0018 0.0000 * 0.0018 0.0000 * 0.0024 0.0000 

0.0012 0.0000 * 0.0012 0.0000 * 0.0015 0.0000 0.0021 0.0003 * 0.0021 0.0000 * 0.0021 0.0000 0.3552 2.1690 0.349 1.9660 0.5452 2.8140 0.0048 0.0017 * 0.0048 0.0000 * 0.0051 0.0000 0.0382 0.2335 0.0041 0.0231 0.0848 0.4377 

0.0764 0.4664 0.0677 0.3814 0.0846 0.4364 

0.0058 0.0354 0.0097 0.0546 0.009 0.0467 

0.0027 0.0000 * 0.0024 0.0000 * 0.003 0.0000 0.0033 0.0193 * 0.003 0.0000 * 0.0051 0.0265 0.0027 0.0017 * 0.0027 0.0056 * 0.003 0.0066 0.0021 0.0000 * 0.0021 0.0000 * 0.0024 0.0000 

0.0033 0.0049 * 0.0039 0.0157 * 0.0039 0.0000 0.2156 1.3170 0.2181 1.2290 0.2561 1.3220 

0.0015 0.0035 * 0.0012 0.0034 * 0.0018 0.0092 

0.0012 0.0081 * 0.0012 0.0005 * 0.0015 0.0073 

1.298 7.9240 1.324 7.4560 1.495 7.7180 

0.0021 0.0000 * 0.0021 0.0011 * 0.0021 0.0063 

0.0399 0.1029 * 0.0429 0.0857 * 0.0459 0.0000 

0.003 0.0184 0.0037 0.0210 0.0032 0.0165 

0.7067 4.3160 0.9224 5.1960 1.09 5.6280 

0.003 0.0078 * 0.0027 0.0058 * 0.003 0.0085 

0.0338 0.2064 0.032 0.1804 0.0387 0.1995 

0.0015 0.0000 * 0.0015 0.0005 * 0.0015 0.0034 0.0021 0.0083 * 0.0018 0.0053 * 0.0021 0.0007 0.0223 0.1363 0.0072 0.0406 0.0719 0.3711 

0.0024 0.0124 * 0.003 0.0170 0.003 0.0156 

Calm: 4.17% Calm: 0.00% Calm: 4.17% 

10/25/08

3.04

315

20.1

6.3NA

10/28/08

11.06

57

24.9

6.7NA

6.1NA

10/31/08

2.49

31

23.4
TABLE 2

Air Filter Sampling Laboratory Values for Inorganic ParametersWinkelman Monitoring StationData Evaluation ReportASARCO LLC Hayden, Arizona Plant Site

Parameter Units

PM10 μg/m3 -- -- 150 7/50 8 -- 150 7 --

Aluminum μg/m3 -- -- -- 5.1 -- --

Antimony μg/m3 13,000 1.46 -- -- -- --

Arsenic μg/m3 2,500 0.000441 -- 0.00045 -- 0.19

Barium μg/m3 -- -- -- 0.52 -- --

Bismuth μg/m3 -- -- -- -- -- --Bromine μg/m3 -- -- -- -- -- --Cadmium μg/m3 250 0.00105 -- 0.0011 -- --

Calcium μg/m3 -- -- -- -- -- --

Chlorine μg/m3 -- -- -- -- -- --Chromium μg/m3 100 0.000158 -- 0.00016 -- --Cobalt μg/m3 10,000 0.000686 -- 0.00069 -- --

Copper μg/m3 -- -- -- -- -- 100

Gallium μg/m3 -- -- -- -- -- --Germanium μg/m3 -- -- -- -- -- --Indium μg/m3 -- -- -- -- -- --Iron μg/m3 -- -- -- -- -- --Lanthanum μg/m3 -- -- -- -- -- --Lead μg/m3 -- -- 1.5 9 10 -- 1.5 9 10 --

Magnesium μg/m3 -- -- -- -- -- --

Manganese μg/m3 2,500 0.0521 -- 0.051 -- --

Mercury μg/m3 1,000 0.313 -- 0.31 -- 1.8

Molybdenum μg/m3 -- -- -- -- -- --

Nickel μg/m3 5,000 0.0079 -- 0.008 -- 6

Palladium μg/m3 -- -- -- -- -- --

Phosphorus μg/m3 -- -- -- -- -- --Potassium μg/m3 -- -- -- -- -- --Rubidium μg/m3 -- -- -- -- -- --Selenium μg/m3 500 18.3 -- -- -- --

Silicon μg/m3 -- -- -- -- -- --

Silver μg/m3 -- -- -- -- -- --Sodium μg/m3 -- -- -- -- -- --Strontium μg/m3 -- -- -- -- -- --Sulfur μg/m3 -- -- -- -- -- --Tin μg/m3 -- -- -- -- -- --Titanium μg/m3 -- -- -- 31 -- --Vanadium μg/m3 -- -- -- -- -- --Yttrium μg/m3 -- -- -- -- -- --Zinc μg/m3 -- -- -- -- -- --Zirconium μg/m3 -- -- -- -- -- --

Table Notes:

1 Arizona Department of Environmental Quality Acute and Chronic Ambient Air Concentrations, Title 18 Chapter 2 Article 17, December 2007 2 Arizona Department of Environmental Quality Ambient Air Quality Standards, Title 18 Chapter 2 Article 2, December 2007 Wind Speed: 3 EPA Region IX Preliminary Remediation Goals, Ambient Air, October 2004 mph 4 EPA National Ambient Air Quality Standards, http://www.epa.gov/air/criteria.html, February 2008 5 California Acute Reference Exposure Levels, March 1999 6 With the exception of arsenic, the averaging time for all listed analytes is one hour. The averaging time for arsenic is four hours. 7 The averaging time for the criteria is 24 hours. 8 The averaging time for the criteria is the annual arithmetic mean. 9 The averaging time for the criteria is the quarterly average.10 Only the PM10 fraction is being measured not the total suspended particulates.11 Percent of Total Mass12 Precipitation measurements are recorded manually by a Hayden-Winkelman High School employee; reliability cannot be verified.13 Bold values with bold outline indicate the result exceeds one or more of the comparison criteria.14 Bold italicized values indicate the non-detected result exceeds one or more of the comparison criteria. Calm: < 115 * = The result is less than three times the level of uncertainty which is shown in place of the result. Wind direction16 -- = Not established toward center17 °C = Degrees Celsius18 % = Percent19 J = Estimated value20 mph = miles per hour21 NA = Not Applicable or Not Analyzed22 NPR = No precipitation recorded.23 μg/m3 = Micrograms per cubic meter24 PM10 = particulate matter with a diameter less than or equal to 10 microns in size25 R = Rejected26 This table should be considered preliminary and will be revised based on incoming data, final data validation and QA/QC.

Precipitation (inches)3

:

Avg Ambient Temperature (oC):

Avg Ambient Relative Humidity (%):

Avg Wind Direction (degrees):

Avg Wind Speed (mph):

EPA

Region IX

Preliminary

Remediation

Goal3

Date:

Arizona

Hazardous Air

Pollutants

Ambient Air

Concentrations

(Chronic)1

EPA

National

Ambient

Air Quality

Standards4

California

Acute

Reference

Exposure

Levels5 6

Arizona

Hazardous Air

Pollutants

Ambient Air

Concentrations

(Acute)1

Arizona

Ambient

Air Quality

Standards2 Result Percent11 Qual Result Percent11 Qual Result Percent1

16.87 NA R NA 13.77 NA 

0.4765 2.9320 R R 0.45 3.4390 

0.003 0.0003 * R R 0.003 0.0000 

0.0123 0.0756 R R 0.0012 0.0050 

0.0045 0.0133 * R R 0.0039 0.0000 

NA NA NA NA NA NA 

0.0021 0.0127 R R 0.0012 0.0086 

0.0021 0.0122 * R R 0.0021 0.0000 

0.4265 2.6250 R R 0.6705 5.1250 

0.0049 0.0301 R R 0.0145 0.1112 

0.0009 0.0029 * R R 0.0009 0.0014 

0.006 0.0038 * R R 0.0048 0.0000 

0.2268 1.3950 R R 0.0155 0.1184 

0.0021 0.0000 * R R 0.0018 0.0004 0.0015 0.0000 * R R 0.0012 0.0018 0.0021 0.0000 * R R 0.0021 0.0000 0.4047 2.4910 R R 0.2609 1.9940 0.0048 0.0000 * R R 0.0042 0.0000 0.0263 0.1617 R R 0.0033 0.0000 

0.0735 0.4523 R R 0.0558 0.4268 0.0077 0.0472 R R 0.0051 0.0389 

0.003 0.0000 * R R 0.0027 0.0000 

0.0036 0.0151 * R R 0.003 0.0000 

0.003 0.0084 * R R 0.0027 0.0086 

0.0024 0.0012 * R R 0.0021 0.0000 

0.003 0.0075 * R R 0.003 0.0202 

0.1998 1.2290 R R 0.1981 1.5140 

0.0017 0.0104 R R 0.0015 0.0101 

0.0012 0.0072 * R R 0.0012 0.0007 

1.264 7.7800 R R 1.21 9.2490 

0.0021 0.0023 * R R 0.0021 0.0061 0.1185 0.3448 * R R 0.0351 0.0396 0.0041 0.0255 R R 0.0044 0.0338 0.4262 2.6230 R R 0.1377 1.0530 

0.003 0.0113 * R R 0.003 0.0122 

0.034 0.2095 R R 0.0266 0.2037 

0.0015 0.0000 * R R 0.0012 0.0000 0.0021 0.0046 * R R 0.0018 0.0000 0.0219 0.1350 R R 0.0028 0.0216 0.0024 0.0078 * R R 0.0024 0.0086 

Calm: 16.67% Calm: 0.00% Calm: 0.00% 

11.6

NA

6.8NA

11/12/08

2.92

11/15/08

11.43

93

20.1

293

14.4

11/18/08

8.76

102

20.0

6.9NA
TABLE 2

Air Filter Sampling Laboratory Values for Inorganic ParametersWinkelman Monitoring StationData Evaluation ReportASARCO LLC Hayden, Arizona Plant Site

Parameter Units

PM10 μg/m3 -- -- 150 7/50 8 -- 150 7 --

Aluminum μg/m3 -- -- -- 5.1 -- --

Antimony μg/m3 13,000 1.46 -- -- -- --

Arsenic μg/m3 2,500 0.000441 -- 0.00045 -- 0.19

Barium μg/m3 -- -- -- 0.52 -- --

Bismuth μg/m3 -- -- -- -- -- --Bromine μg/m3 -- -- -- -- -- --Cadmium μg/m3 250 0.00105 -- 0.0011 -- --

Calcium μg/m3 -- -- -- -- -- --

Chlorine μg/m3 -- -- -- -- -- --Chromium μg/m3 100 0.000158 -- 0.00016 -- --Cobalt μg/m3 10,000 0.000686 -- 0.00069 -- --

Copper μg/m3 -- -- -- -- -- 100

Gallium μg/m3 -- -- -- -- -- --Germanium μg/m3 -- -- -- -- -- --Indium μg/m3 -- -- -- -- -- --Iron μg/m3 -- -- -- -- -- --Lanthanum μg/m3 -- -- -- -- -- --Lead μg/m3 -- -- 1.5 9 10 -- 1.5 9 10 --

Magnesium μg/m3 -- -- -- -- -- --

Manganese μg/m3 2,500 0.0521 -- 0.051 -- --

Mercury μg/m3 1,000 0.313 -- 0.31 -- 1.8

Molybdenum μg/m3 -- -- -- -- -- --

Nickel μg/m3 5,000 0.0079 -- 0.008 -- 6

Palladium μg/m3 -- -- -- -- -- --

Phosphorus μg/m3 -- -- -- -- -- --Potassium μg/m3 -- -- -- -- -- --Rubidium μg/m3 -- -- -- -- -- --Selenium μg/m3 500 18.3 -- -- -- --

Silicon μg/m3 -- -- -- -- -- --

Silver μg/m3 -- -- -- -- -- --Sodium μg/m3 -- -- -- -- -- --Strontium μg/m3 -- -- -- -- -- --Sulfur μg/m3 -- -- -- -- -- --Tin μg/m3 -- -- -- -- -- --Titanium μg/m3 -- -- -- 31 -- --Vanadium μg/m3 -- -- -- -- -- --Yttrium μg/m3 -- -- -- -- -- --Zinc μg/m3 -- -- -- -- -- --Zirconium μg/m3 -- -- -- -- -- --

Table Notes:

1 Arizona Department of Environmental Quality Acute and Chronic Ambient Air Concentrations, Title 18 Chapter 2 Article 17, December 2007 2 Arizona Department of Environmental Quality Ambient Air Quality Standards, Title 18 Chapter 2 Article 2, December 2007 Wind Speed: 3 EPA Region IX Preliminary Remediation Goals, Ambient Air, October 2004 mph 4 EPA National Ambient Air Quality Standards, http://www.epa.gov/air/criteria.html, February 2008 5 California Acute Reference Exposure Levels, March 1999 6 With the exception of arsenic, the averaging time for all listed analytes is one hour. The averaging time for arsenic is four hours. 7 The averaging time for the criteria is 24 hours. 8 The averaging time for the criteria is the annual arithmetic mean. 9 The averaging time for the criteria is the quarterly average.10 Only the PM10 fraction is being measured not the total suspended particulates.11 Percent of Total Mass12 Precipitation measurements are recorded manually by a Hayden-Winkelman High School employee; reliability cannot be verified.13 Bold values with bold outline indicate the result exceeds one or more of the comparison criteria.14 Bold italicized values indicate the non-detected result exceeds one or more of the comparison criteria. Calm: < 115 * = The result is less than three times the level of uncertainty which is shown in place of the result. Wind direction16 -- = Not established toward center17 °C = Degrees Celsius18 % = Percent19 J = Estimated value20 mph = miles per hour21 NA = Not Applicable or Not Analyzed22 NPR = No precipitation recorded.23 μg/m3 = Micrograms per cubic meter24 PM10 = particulate matter with a diameter less than or equal to 10 microns in size25 R = Rejected26 This table should be considered preliminary and will be revised based on incoming data, final data validation and QA/QC.

Precipitation (inches)3

:

Avg Ambient Temperature (oC):

Avg Ambient Relative Humidity (%):

Avg Wind Direction (degrees):

Avg Wind Speed (mph):

EPA

Region IX

Preliminary

Remediation

Goal3

Date:

Arizona

Hazardous Air

Pollutants

Ambient Air

Concentrations

(Chronic)1

EPA

National

Ambient

Air Quality

Standards4

California

Acute

Reference

Exposure

Levels5 6

Arizona

Hazardous Air

Pollutants

Ambient Air

Concentrations

(Acute)1

Arizona

Ambient

Air Quality

Standards2 Result Percent11 Qual Result Percent11 Qual Result Percent1

12.91 NA 12.2 NA 9.43 NA 

0.1681 1.3450 0.2686 2.2780 0.16 1.7380 

0.01 0.0799 0.0066 0.0467 * 0.0083 0.0905 

0.0339 0.2712 0.0082 0.0699 0.0104 0.1130 

0.0048 0.0094 * 0.0048 0.0367 * 0.0042 0.0082 0.0281 0.2245 0.0134 0.1134 NA NA 0.0017 0.0139 0.0009 0.0060 * 0.0009 0.0092 

0.0027 0.0121 * 0.0024 0.0080 * 0.0024 0.0031 

0.1773 1.4180 0.5217 4.4240 0.2266 2.4600 0.0075 0.0000 * 0.0548 0.4648 0.0066 0.0424 0.0012 0.0000 * 0.0009 0.0028 * 0.0012 0.0000 

0.0048 0.0128 * 0.0042 0.0000 * 0.0036 0.0087 

0.2678 2.1420 0.1416 1.2010 0.142 1.5430 

0.0015 0.0000 * 0.0012 0.0000 * 0.0015 0.0000 0.0012 0.0000 * 0.0012 0.0000 * 0.0012 0.0000 0.0027 0.0000 * 0.0027 0.0000 * 0.0027 0.0000 0.2719 2.1750 0.2633 2.2330 0.177 1.9230 0.0048 0.0000 * 0.0048 0.0000 * 0.0042 0.0000 0.0647 0.5179 0.0377 0.3198 0.0266 0.2894 0.0258 0.0000 * 0.048 0.3186 * 0.0234 0.0000 0.0019 0.0154 0.0029 0.0244 0.0024 0.0256 0.0021 0.0000 * 0.0021 0.0000 * 0.0021 0.0000 0.0029 0.0234 0.0024 0.0204 0.0024 0.0189 0.0021 0.0000 * 0.0021 0.0000 * 0.0021 0.0000 0.0021 0.0019 * 0.0021 0.0000 * 0.0021 0.0000 0.0045 0.0000 * 0.0042 0.0000 * 0.0039 0.0000 0.1324 1.0590 0.1765 1.4970 0.0927 1.0070 0.0014 0.0109 0.0009 0.0064 * 0.0009 0.0000 0.0107 0.0855 0.0024 0.0208 0.0019 0.0210 0.5132 4.1060 0.8409 7.1310 0.492 5.3430 0.0024 0.0004 * 0.0024 0.0068 * 0.0024 0.0000 0.0489 0.0000 * 0.1314 1.1140 0.0972 0.4244 0.0009 0.0053 * 0.0043 0.0367 0.0022 0.0240 0.7646 6.1170 0.3659 3.1030 0.4382 4.7580 0.0033 0.0023 * 0.0033 0.0168 * 0.0033 0.0179 0.0167 0.1333 0.019 0.1609 0.0129 0.1401 0.0012 0.0000 * 0.0012 0.0000 * 0.0009 0.0000 0.0012 0.0000 * 0.0012 0.0000 * 0.0012 0.0000 

0.036 0.2878 0.0226 0.1913 0.0156 0.1692 

0.0015 0.0038 * 0.0015 0.0028 * 0.0015 0.0000 

Calm: 8.39% Calm: 12.50% Calm: 29.17%

11/30/08

3.60

306

13.4

16.2

NA

12/3/08

1.80

204

13.9

31.7

NA

19.4

NA

12/6/08

2.24

326

12.0
TABLE 3

Comparison of Ambient Air Concentrations at Organ Pipe, Hayden, and Winkelman Monitoring StationsData Evaluation ReportASARCO LLC Hayden, Arizona Plant Site

Air

Contaminant

EPA Region IX

Preliminary

Remediation Goal1

(μg/m3)

Average Ambient

Air Concentration

at Organ Pipe

National Monument2

(μg/m3)

Average Ambient

Air Concentration

at Hayden Jail

Monitoring Station3

(μg/m3)

Average Ambient

Air Concentration

at Hayden4

(μg/m3)

Average Ambient

Air Concentration

at Winkelman5

(μg/m3)

Ratio of 

Concentration

at Hayden to

Organ Pipe

National Monument

Ratio of 

Concentration

at Winkelman to

Organ Pipe

National Monument

PM10 -- 16 NA 34.7 17.9 2.17 1.12 

Arsenic 0.00045 ND (0.0003-0.0006) 0.0331 0.0209 0.00780 34.8-69.7 6 13.0-26.0 6 

Cadmium 0.0011 ND (0.0006) 0.0168 0.0022 ND (0.0018-0.0027) 3.67 6 3.00-4.50 6 

Chromium 0.00016 0.000493 0.00641 0.0013 0.000664 2.64 1.35 

Copper -- 0.00142 0.865 0.0501 0.222 35.3 156 

Lead -- 0.00133 0.0686 0.101 0.0282 75.9 21.2 

Table Notes:

1 EPA Region IX Preliminary Remediation Goals, Ambient Air, October 20042 The data is based on analysis of 15 PM10 filter samples collected at a 24-day interval from January 2, 2006 to December 4, 2006 at Organ Pipe National Monument.3 Sandra Wardwell, Data Management Team, Arizona Department of Environmental Quality, "ADEQ XRF Data Hayden PM10 Dichot Filters 1991-2001", E-mail to Prabhat Bhargava, October 13, 2005.4 The date range of the Hayden data is between November 13, 2007 and November 30, 2008.6 The date range of the Winkelman data is between January 12, 2008 and December 9, 2008.7 Ratios were calculated using the reporting limit when the results were not detected.8 Bold values with bold outline indicate the value exceeds the comparison criteria.9 Bold italicized values have detection limits above one or more of the comparison criteria.10 -- = Not established11 NA = Not available12 ND = Not detected; reporting limit is shown in place of a result.13 PM10 = particulate matter with a diameter less than or equal to 10 microns in size14 μg/m3 = micrograms per cubic meter
This page is intentionally blank. 
1

Appendix D 

Control Measures and Technologies Implemented at the ASARCO 

 Ray Complex and Hayden Smelter and Concentrator 

Table 1 

Process and Control Equipment Description 

Equipment Quantity Manufacturer Model/Type Serial 

No. 

Date 

Installed 

or 

modified 

Size Rated 

Capacity 

New or 

Existing

Sampling and 

Unloading 

Operations: 

 

Dump hopper 1 Linkbelt stainless 

steel lining 

n/a 1983 12'x28.6' 175 tons per 

hour (tph), 

1,533,000 

tons per 

year (tpy) 

Existing 

Unloading 

conveyors 

3 Linkbelt n/a 60"x17'8" 175 tph, 

1,533,000 

tpy 

Existing 

 51M n/a 1964/1968 cars: 

30"x20' 

 Existing 

Bedding area - 

4 storage bins 

4 Concrete n/a n/a 1964/1968 220'x40'x20' 30,000 wet 

tons, 

26,000 dry 

tons 

Existing 

Bedding area - 

Vibrating 

screen/ grizzly 

1 Ty-rock Isurface/F300 7308 1967 4' x 8' n/a Existing 

Reclaim 

hopper & 

feeder 

1 Feeder Belt, 

Rex Chainbelt 

Inc. 

n/a n/a 1968 Hopper: 20 

cy 

Belt feeder: 

42" wid. x 

20' centers 

150 tph, 

1,533,000 

tpy 

Existing 

No. 2 main 

inclined 

conveyor 

1 n/a 50 HP motor n/a 1982 24" width 

by 625' 

length 

300 tph, 

2,628,000 

tpy 

Existing 

No. 3 inclined 

conveyor 

1 Boston Dulon 

600 

3 -ply n/a 1982 30" width 

by 439' 

length 

300 tph, 

2,628,000 

tpy 

Existing 

Delumper at 

oxygen furnace 

charge system 

1 Jeffrey 

Manufacturing 

Division 

Jeffrey 

5WR5 

/Reversible 

impactor 

13492 1982 n/a 300 tph, 

2,628,000 

tpy 

Existing 

No. 4 

Horizontal 

Conveyor 

1 Boston Dulon 

600 

4-ply n/a 1982 42" width 

by 139' 

length 

300 tph, 

2,628,000 

tpy 

Existing 

Flash Furnace 

Building 

Operations: 

 
2

Table 1 

Process and Control Equipment Description 

Equipment Quantity Manufacturer Model/Type Serial 

No. 

Date 

Installed 

or 

modified 

Size Rated 

Capacity 

New or 

Existing

Wet bin 

conveyors, 

dryer feed & 

weigh belts 

4 ASARCO 

design 

n/a n/a 1983 30" width 85 tph, 

744,600 tpy 

Existing 

Hammer Mill 1 Pennsylvania 

Crusher 

Corporation 

GRT#1 n/a 1983 42" x 12" x 

31" 

6tph, 

52,560 tpy 

Existing 

Nos. 1 & 2 

Fluid bed 

dryers with 

burners 

2 Fuller 11-81-

20337-106 

Farrier 

natural gas 

burners 

n/a 1983 11'3" 

diameter 

(ID shell) x 

26' high 

Production:

 64 

wet ton/hr, 

560,640 tpy 

Burner 

firing gas: 

38,000 CFH 

x 2 burners 

Burner 

firing oil: 

270 gph x 2 

burners 

Maximum 

dryer usage: 

6,915 hours 

per year 

New 

Blow tank 

pneumatic 

conveyor 

(hammer mill 

feeds surge bin 

then material 

drops into line 

with air blown 

to dry dust bin) 

1 Fuller/Abresist n/a n/a 1983 4" 4.2 tph, 

36,792 tpy 

Existing 

Fluid bed dryer 

product 

baghouse Nos. 

1 & 2 

2 Peabody 

Process 

Systems, Inc. 

PMTR-10-

1692 TW 

Pulse 

n/a 1982 n/a Gas flow 

rate: 55,000 

ACFM 

New 

Dry screw 

conveyors #1-

8, furnace 

charge system 

8 FMC n/a n/a 1983 16" and 9" 

width 

56.9 tph, 

498,444 tpy 

Existing 

Feed screw 

conveyors #10-

16, furnace 

charge system 

7 FMC n/a n/a 1983 12" width n/a Existing 

200-ton west 

wet bins nos. 1 

& 2 

2 n/a n/a n/a 1983 n/a n/a Existing 
3

Table 1 

Process and Control Equipment Description 

Equipment Quantity Manufacturer Model/Type Serial 

No. 

Date 

Installed 

or 

modified 

Size Rated 

Capacity 

New or 

Existing

200-ton dry 

bins nos. 1 

through 4, each 

served by one 

ventilation 

baghouse 

4 DCE Vokes DLM 

V10/10 F3 

20 envelope 

filter bags 

n/a 1983 Cloth area: 

105 sq. ft. 

1050 acfm Existing 

30-ton dust bin 

no. 1 served by 

a ventilation 

baghouse 

1 BHA 4 Cartridge 

Filters 

n/a 1998 Cloth area: 

480 sq. ft. 

1200 acfm Existing 

30-ton flux bin 

no. 3 served by 

a ventilation 

baghouse 

1 Fuller Pulse n/a 1983 Cloth area: 

166 sq. ft. 

1200 acfm Existing 

Oxygen flash 

furnace with 

burner (smelter 

and 

concentrator) 

1 Inco with oxygen 

burner 

n/a 1983 24 ft. x 80 

ft. 

24,000 tpd 

concentrates 

When 

process is 

down, 

furnace is 

kept hot 

with up to 4 

natural gas 

burners. 

Maximum 

gas usage is 

91,113 

CFH. 

New 

WGHS 

Venturi 

Scrubber 

1 Swemco Inc. SW-A138696 

Variable 

throat 

14520 August, 

1997 

42" inlet 

diameter 

flow rate 

62,913 acfm 

n/a 

WGHS 

Disengagement 

vessel 

1 Swemco Inc. SW-A138696 14525-

100 

August, 

1997 

5' diameter 

inlet 

flow rate 

62,913 acfm 

n/a 

WGHS 

Condensing 

Heat 

Exchanger 

1 Fleck, Ltd. 95-336 

Shell & tube 

1781 1997 8' diameter 

vessel 

80 MBtu/hr 

heat 

exchange 

n/a 

WGHS 

Saturation 

Tower 

1 Structural 

Steel and 

Fabrication 

Company 

Refractory 

lined wet 

tower 

n/a fourth 

quarter 

1997 

25' high x 8' 

dia. 

125,168 

acfm 

n/a 

WGHS 

Stripping 

Tower 

1 Structural 

Steel and 

Fabrication 

Company 

Disk and 

Do-nut 

n/a fourth 

quarter 

1997 

34' high x 3' 

dia. 

1,032 acfm n/a 

Revert 
4

Table 1 

Process and Control Equipment Description 

Equipment Quantity Manufacturer Model/Type Serial 

No. 

Date 

Installed 

or 

modified 

Size Rated 

Capacity 

New or 

Existing

Crushing 

System: 

Feeder 1 Kue-Ken Hydro 

stroke feeder 

270 1980 n/a 200 tph, 

42,000 tpy 

New 

Jaw Crusher 1 Kue-Ken n/a 11011781 1980 25' x 42' 200 tph, 

42,000 tpy 

New 

Vibrating 

screen 

1 Tyler Industry R1204X 502626 1980 n/a 200 tph, 

42,000 tpy 

New 

Cone crusher 1 Kue-Ken n/a 3095132 1980 n/a 200 tph, 

42,000 tpy 

New 

Belt conveyors 2 Kue-Ken BC-203 and 

BC-206 

n/a 1980 n/a 200 tph, 

42,000 tpy 

New 

Revert 

crushing 

baghouse 

1 Peabody 

Process 

Systems, Inc. 

PMTR-10-

592W 

pulse 

01-5011-

01 

1989 6,974 sq. ft. 32,000 acfm New 

Converter 

Building: 

 

Converters 5 n/a Pierce Smith 

Each 

converter 

has a natural 

gas burner to 

keep vessel 

heated 

during 

holding fire. 

n/a 1969 one with 

13'x35', one 

with 13'x30' 

and three 

with 13'x33' 

100 tons 

copper per 

cycle 

170 tons 

matte per 

cycle 

40 tons cold 

dope per 

cycle 

Maximum 

gas usage: 

17,695.8 

CFHx1.5 

converters 

Existing 

Converter 

silica 

conveying 

system 

1 B.F. Goodrich 

for belts 

Consists of 

three 

unloading 

hoppers with 

conveying 

belts 

n/a 1968 24" belts 

44.3' length 

60 tph, 

525,600 tpy 

Existing 

Converter 

primary 

hooding 

5 ASARCO 

design 

Steel n/a 1999/2000 length 10.28 

feet 

n/a Existing 

Converter 

cyclones 

10 Ducon Model 1000 

with 

high 

efficiency 

duclones 

n/a 1966 and 

1968 

1000 n/a Existing 

Converter 

spray chamber 

1 ASARCO Spray n/a 1973 n/a n/a Existing 

Converter 1 ASARCO n/a n/a 1979 n/a n/a Existing 
5

Table 1 

Process and Control Equipment Description 

Equipment Quantity Manufacturer Model/Type Serial 

No. 

Date 

Installed 

or 

modified 

Size Rated 

Capacity 

New or 

Existing

secondary 

hooding 

design 

Secondary 

hoods 

baghouse 

1 Hosakawa 

Mikropul 

1000 J-10-

30-TRH 

pulse type 

950281 

H1-H7 

1996 Seven 

modules 

with 11,780 

sq. ft. per 

module 

300,000 

acfm total 

working 

volume, 

0.1158 

gr/dscf 

maximum 

dust 

loading, and 

0.0861 

gr/dscf inlet 

loading 

n/a 

Gas Cleaning 

Plant: 

 

Process gas 

precipitators 

4 Chemiebau Four train n/a 1969 n/a 200,000 

scfm 

n/a 

Gas Scrubbers 5 Rust 

Engineering 

Open towers 

(3) and 

packed (2) 

n/a 1961 n/a n/a n/a 

Mist 

precipitators 

8 ASARCO 

design 

Mist wet 

ESP 

Gas flows 

through 4 

parallel 

trains, each 

2 units deep, 

thus 4 inlets 

and 4 outlets 

n/a 1983 180 tubes 

15 foot 

length 

n/a n/a 

Gas cleaning 

plant pugmill 

1 ASARCO n/a n/a 1967 n/a n/a n/a 

Acid Plant: 

Acid plant 1 Monsanto double 

contact 

n/a 1983 n/a 2,820 STPD 

(100% acid 

basis) as 

93% 

H2SO4 

using 12.4% 

SO2 

24,703,200 

STPY 

n/a 

Acid plant 

preheater 

1 Thermal 

Transfer 

Corporation 

Natural gas 

fired 

n/a 1983 22.75'x8' 

O.D. shell 

40,000 scfm

of start up air

107,925 

CFH max. 

fuel input 

Existing 

Anode Plant: 
6

Table 1 

Process and Control Equipment Description 

Equipment Quantity Manufacturer Model/Type Serial 

No. 

Date 

Installed 

or 

modified 

Size Rated 

Capacity 

New or 

Existing

Anode 

furnaces #1 & 

#2 with 

burners, Anode 

furnace #3 

with burners 

(spare) 

3 n/a Fuller Co. 

Natural gas 

fired 

n/a 1971 13'x35' 330 ton per 

furnace 

Gas usage 

for both 

furnace: 

648 cfm 

max. 

measured 

and 736.7 

cfm (402 

gph) max. 

estimated 

Existing 

Anode steam 

boiler 

1 Parker Packaged 

boiler 

horizontal 

drum, 

natural gas 

fired 

n/a 1995 90 HP 3,780,000 

Btu/hr 

Existing 

Anode casting 

wheels, north 

& south 

2 StearnsRodgers 

Corporation 

n/a n/a 1972 29' diameter 24 mold Existing 

Anode launder 

burners 

6 Hauck RFS 1120A 

Natural gas 

fired 

n/a 1972 2" n/a Existing 

Anode ladle 

burners 

3 ASARCO Natural gas 

fired 

n/a 1972 4" n/a Existing 

Oxygen Plant: 

Oxygen plant 

boiler 

1 General 

Electric 

CB 

Packaged 

Boiler 

700X-300, 

natural gas 

fired 

L-75227 1982 n/a 8,740,000 

Btu/hr 

8,740 CFH 

designed 

natural gas 

usage 

Existing 

Oxygen plant 1 Air Products Consists of 

main air 

compressor, 

oxygen 

compressor, 

direct 

contact after 

cooler, 

liquid 

oxygen 

storage tank 

and cooling 

tower 

n/a 1983 n/a 650 tpd 

gaseous 

oxygen 

5,694,000 

tpy 

Existing 

Furnace 

Ventilation 

 
7

Table 1 

Process and Control Equipment Description 

Equipment Quantity Manufacturer Model/Type Serial 

No. 

Date 

Installed 

or 

modified 

Size Rated 

Capacity 

New or 

Existing

Gas Control: 

R & R 

Electrostatic 

precipitator 

1 ASARCO Inc. Plate wire n/a built in 

1961 and 

expanded 

in 1968 

62'x76' 43,350 

dscfm 

n/a 

R & R ESP 

screw 

conveyors #1-

15, 17, 18 

17 Screw 

Conveyor 

Corporation 

n/a n/a 1968 #1-15: 9" 

#17, 18: 12" 

12 tph, 

105,120 tpy 

Existing 

R & R ESP 

Bucket 

Elevator 

1 Automation 

Supply 

3-SA n/a 1975 48' center to 

center 

35 tph, 

306,600 tpy 

Existing 

R & R ESP 

Pugmill 

1 Automation 

Supply & 

Engineering 

Double shaft n/a 1968 n/a 15 ton 

storage 

Existing 

Other 

Processes: 

 

Reverts (matte 

& slag) Screen 

#1, south of 

acid tanks 

1 Screen USA BF35E2/two 

deck 

4'x8' for 

closed single 

deck and 

12'x14' for 

open single 

deck 

3011096 1996 4'x8' and 

12'x14' 

100 tph, 

44,000 tpy 

New 

Reverts (matte 

& slag) Screen 

#2, south of 

converter isle 

1 Grizzly Open single 

deck 

n/a 1994 10'x15' 

33/34" 

openings 

200 tph, 

40,000 tpy 

New 

WTP lime silo 1 Portec 850-

QLH/Steel 

n/a 1983 n/a 150 ton Existing 

WTP lime silo 

baghouse 

1 Portec DF-44 n/a 1983 1 HP 1,176 cfm n/a 

0.5 million 

gallon diesel 

storage tank 

1 Garland Steel 

Company 

steel n/a fourth 

quarter 

1971 

500,000 

gallons 

diameter 52 

feet height 

32 feet 

n/a Existing 
8

Table 2 

Stack Information 

Identification Description Building Size Exit Gas Temperature Exit Gas 

Velocity 

Height Inside 

Dimensions

HP-1 Acid plant 

(main stack 

core) 

n/a 303 ΕF 19 fps 1000 feet 17 foot 

diameter 

HP-2 Main stack 

annulus 

(ventilation 

gases) 

n/a 135 ΕF 34 fps 920 feet 432 sq. ft. 

HP-4 Revert 

crusher 

baghouse 

stack 

n/a 99 ΕF 42 fps 46 feet 3.83 foot 

diameter 

HP-26 #2 acid plant 

preheater 

n/a n/a n/a 65 feet 5.42 foot 

diameter 

HP-28 Oxygen plant 

boiler 

n/a 346 ΕF (estimated) 1,650 scfm 

(estimated) 

22 feet 1.66 foot 

diameter 

HP-32 200 ton dry 

#1 bin 

ventilation 

baghouse 

(located 

inside furnace 

building) 

n/a Unknown Capacity 1050 

acfm 

6 feet 0.5' x 0.5' 

HP-33 200 ton dry 

#2 bin 

ventilation 

baghouse 

(located 

inside furnace 

building) 

n/a Unknown Capacity 1050 

acfm 

6 feet 0.5' x 0.5' 

HP-34 200 ton dry 

#3 bin 

ventilation 

baghouse 

(located 

inside furnace 

building) 

n/a Unknown Capacity 1050 

acfm 

6 feet 0.5' x 0.5' 

HP-35 200 ton dry 

#4 bin 

ventilation 

baghouse 

(located 

inside furnace 

building) 

n/a Unknown Capacity 1050 

acfm 

6 feet 0.5' x 0.5' 
9

Table 2 

Stack Information 

Identification Description Building Size Exit Gas Temperature Exit Gas 

Velocity 

Height Inside 

Dimensions

HP-38 30 ton dust 

bin 

ventilation 

baghouse #1 

(part of 

pneumatic 

conveying 

system) 

n/a Ambient Capacity 480 

acfm 

12.25 feet 0.68' x 0.66' 

HP-39 30 ton dust 

bin 

ventilation 

baghouse #2 

(part of 

pneumatic 

conveying 

system) 

n/a Ambient Capacity 480 

acfm 

12.25 feet 0.68' x 0.66' 

HP-50 Anode steam 

boiler

n/a n/a n/a 32 feet 20 inch 

diameter
10

Table 3 

Continuous Emission Monitoring Systems Information

Type Manufacturer Model Serial No. Range Location

Acid Plant Tail 

Gas SO2

Monitor 

Ametek 4600B - Analyzer 

4000 - Control Station 

6146 0-0.20% SO2 At the acid plant exit prior 

to the merging with the 

main flue to stack 

Acid Plant Tail 

Gas Flow 

Monitor 

EMRC/Rosemount Mark 5/ 

3051CD1A22A1AB4M5 

0306343 0-2.5 “H2O Dp 

S-Type Pitot 

At the acid plant exit prior 

to the merging with the 

main flue to stack 

Acid Plant Tail 

Gas Opacity 

Monitor 

Lear Ziegler 1100M 0833 0-100% opacity At the acid plant exit prior 

to the merging with the 

main flue to stack 

R & R Flue 

Opacity 

Monitor 

Monitor Labs 550 5500157 0-100% opacity At outlet flue of the R & R 

Cottrell ESP prior to the 

merging with the secondary 

hoods off-gas flue 

Converter 

Secondary 

Hoods Off-gas 

SO2 Monitor 

Ametek 4600B - Analyzer 

4000 - Control Station 

5289 0-1.0% SO2 At the secondary hooding 

flue before baghouse 

Converter 

Secondary 

Hoods Off-gas 

Flow Monitor 

EMRC/Rosemount Mark 5/ 

3051CD1A22A1AB4M5 

86585 0-2.5 “H2O Dp 

S-Type Pitot 

At the secondary hooding 

flue before baghouse 

Furnace 

Ventilation 

Gas SO2

Monitor 

Ametek 4600B - Analyzer 

4000 - Control Station 

6274 0-0.4% SO2 At the furnace vent flue 

prior to the merging with 

dryer exhaust gases 

Furnace 

Ventilation 

Gas Flow 

Monitor 

EMRC/Rosemount Mark 5/ 

3051CD1A22A1AB4E5 

0538569 0-2.5 “H2O Dp 

S-Type Pitot 

At the furnace vent flue 

prior to the merging with 

dryer exhaust gases
11

Table 4 

Ambient Sulfur Dioxide Analyzers in the Hayden Area

Identifier Unit Make/Model Owned and Operated by Location

MT0 Montgomery 

Ranch 

Thermo Environmental pulsed 

fluorescent Model 43B 

ASARCO 2.52 miles 

northwest of 

ASARCO 

JL Jail - ASARCO Thermo Environmental pulsed 

fluorescent Model 43C 

ASARCO 0.58 miles west of 

ASARCO 

HJ0 Hayden Junction Thermo Environmental pulsed 

fluorescent Model 43B 

ASARCO 2.00 miles west of 

ASARCO 

GA Garfield Avenue Thermo Environmental pulsed 

fluorescent Model 43C 

ASARCO 0.56 miles south of 

ASARCO 

GH0 Globe Highway Thermo Environmental pulsed 

fluorescent Model 43B 

ASARCO 0.50 miles east of 

ASARCO 

JL Jail - ADEQ Thermo Electron pulsed fluorescent 

(TECO) Model 40 

ADEQ 0.58 miles west of 

ASARCO

Table 5 

Ambient PM10 Samplers in the Hayden PM10 Nonattainment Area

Identifier Unit Make/Model Owned and Operated by Location 

JL Hayden Old Jail 

- ADEQ 

Tapered Element Oscillating 

Microbalance Technology 

(TEOM) 

ADEQ 0.58 Miles west 

of ASARCO 

RS Riverside 

Maintenance 

Yard 

Anderson Hi-Vol Pinal County Air Quality 

Control District 

15.5 Miles 

northwest of 

Hayden 
12

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1

Appendix E 

ADEQ Memo Certifying Air Quality Data for the Hayden Area 
2

This page is intentionally blank. 
1

Date: December 1, 2009 

To: Ira Domsky, Deputy Director 

Air Quality Division 

Through: Steven Peplau, Section Manager 

Air Assessment Section 

From: Sandra Wardwell, Unit Manager 

Data Management & QA Unit 

Subject: Evaluation of QA/QC information for Pb samples collected by EPA in Hayden and 

Winkelman 

EPA Region 9 Superfund began environmental sampling in the Hayden-Winkelman area in November 

2006. Air quality samples of particulate matter were analyzed by a contract laboratory (Chester LabNet). 

The analytical results for lead (Pb) from samples collected in 2006-2008 were used by ADEQ to 

recommend the Hayden area as nonattainment for Pb under the revised NAAQS. ADEQ reported these 

data collected at the EPA Superfund sites in Hayden and Winkelman to the EPA Air Quality System 

(AQS) database on August 27, 2009, listing EPA Region 9 as the Primary Quality Assurance 

Organization (PQAO) and ADEQ as the Reporting Organization. 

This document describes ADEQ's assessment of the quality assurance procedures used by EPA Region 9 

Superfund for collection and validation of the air quality samples. 

DOCUMENTS

Project Plans

The EPA contracted CH2M Hill to conduct site characterization and remedial activities at the ASARCO 

LLC Hayden Plant Site in 2005. CH2M Hill submitted a sampling and analyses plan to EPA consisting of 

3 documents in November 2005: 

• Quality Assurance Project Plan (QAPP) 

• Field Sampling Plan (FSP) 

• Data Management Plan (DMP) 

The QAPP was prepared following EPA guidelines: 

• EPA guidance for Quality Assurance Project Plans (2002) 

• EPA Requirements for Quality Assurance Project Plans (2001) 

Collection of air samples began in November 2006. The QAPP describing Project Management/Data 

Quality Objectives, Measurement Data Acquisition, Assessment/Oversight, and Data Validation and 

Usability was in place prior to the start of sampling. 

Memorandum 
2

CH2M Hill was the contractor for the remedial investigation from 2005 to 2009. ITSI assumed the 

contract in 2009. ITSI added addendums to the sampling and analysis plan documents to change the 

responsible parties listed in the plans. 

These documents were obtained from the ITSI ftp website. 

INSTRUMENTATION

Two Partisol-Plus Model 2025 Sequential Air Samplers are being used for this project. This samples has 

an EPA PM10 reference designation of RFPS-1298-127. The designation was given in December, 1998. 

These samplers also meet the CFR requirements for PM10 coarse samplers ( PM10C ) since a Federal 

Register notice published June 2, 2009 (page 26395), announced this sampler received designation for 

coarse (PM10 -PM2.5) sampling as part of a pair of samplers with a new reference designation of RFPS0509-176. This sampler meets the requirements of 40 CFR 50 Appendices Q and R. 

Field Sheets

Calibration and flow checks for the air quality samplers at the Winkelman and Hayden monitoring sites 

were conducted as scheduled in the QAPP. Review of the field sheets indicates one monthly flow check 

could not be completed due to a pump failure at the Hayden monitor (August 21, 2008). Chain of custody 

information for the samples collected since the last good check (August 18, 2008) were reviewed to 

determine if the prior samples were valid. All samples are valid; the pump failure occurred on the day of 

the check. Consequently, repairs to the sampler were made and the next valid sample occurred on 

September 12, 2008. 

These documents were obtained from the ITSI ftp website. 

Chain of Custody Forms and Laboratory Reports. 

Chain of custody information was collected for each sample. This information is included in the 

Laboratory reports, which also include a statement certifying the validity of the results, and precision, 

accuracy, and replicate results. The reports also include a Transmittal Memorandum with each batch of 

filters from the consultant to the laboratory. This memorandum lists the valid filters to be processed and 

also lists the invalid filters. 

These reports were obtained from ITSI. 

DATA

The DMP states in Section D.1, 'All data for all parameters will undergo two levels of review and 

validation: 1)at the laboratory, and 2) outside the laboratory by the EPA quality Assurance Management 

Section or their designee." The laboratory prepared and shipped all filters to the consultant. The 

consultant loaded the samplers and collected the filters after the sampler ran. The consultant's transmittal 

memorandum accompanying the filters and chain of custody information to the laboratory lists valid and 

invalid filters. This indicates the field personnel were invalidating samples if the sampler was not 

operating correctly or if the filter was damaged during loading and unloading of the sampler. The 

laboratory analyzed the valid filters. 

A spreadsheet of validated data was obtained from John Hillenbrand, EPA Region 9 in May, 2009. This 

file lists analytical results for samples collected 10/22/2006 through May 13, 2009. These results had been 

reviewed and certified by the contract laboratory (see Chain of Custody Forms and Laboratory Reports 

above). ADEQ assumed EPA reviewed the data results since validation flags, graphs and other 

information was included in the spreadsheet. 
3

Preliminary Report

CH2M Hill submitted a Technical Memorandum to EPA on December 31, 2008 entitled, "Preliminary 

Evaluation of PM10 and Metals Concentrations from October 2007 to December 2008 in Ambient Air at 

the Hayden and Winkelman Monitoring Stations". The report used results from samples collected 

11/13/2007 through 11/30/2008. Several samples are labeled 'rejected' with no reason given in the tables 

of analytical and meteorological results. Footnote 28 to Tables 1 and 2 states: "This table should be 

considered preliminary and will be revised based on incoming data, final data validation and QAQC." 

The report identifies three 3-month means in exceedance of the NAAQS at the Hayden monitoring station 

in 2008. 

The report was obtained from EPA Region 9, John Hillenbrand. 

CONCLUSIONS

1. A QAPP was submitted to EPA in November 2005, prior to the start of sampling in October 2006. 

This complies with the EPA requirement for air monitoring programs to have an approved QAPP prior 

to the start of sampling. 

2. Addendums to the QAPP documents were made by the new consultant in March 2009. 

3. Instrument checks were performed as described in the Field Sampling Plan. Copies of the checks are 

available ITSI. 

4. Laboratory reports contain chain of custody information, transmittal information, and laboratory 

quality control data along with the analytical results. 

5. ADEQ's review of the above information concludes the lead data provided by Region 9 Superfund has 

experienced at least 3 levels of validation, (sampler field checks and verification of sample validity 

immediately after collection, laboratory analysis and quality control checks of laboratory procedures, 

and review by EPA Superfund staff. These procedures are comparable to the procedures followed by 

ADEQ air assessment staff. 

6. The preliminary report by CH2M Hill omitted several sample results that were included in the EPA 

spreadsheet. CH2M Hill footnotes do not indicate why those samples were omitted but do state that 

additional validation and QA/QC could change the results included in the report. ADEQ review of all 

the QA/QC documentation supports EPA’s determination that the samples and the data generated from 

those samples were valid. 

7. All violations of the 2008 Pb NAAQS calculated by ADEQ and included in the recommendation to 

designate the Hayden area as nonattainment are accurate and valid. 
4

This page is intentionally blank.
1

Appendix F 

ASARCO Contractor Zephyr Environmental Corporation 

Report on ADEQ’s Pb Boundary Recommendation
1

This page is intentionally blank. 
REVIEW OF 

ARIZONA DEPARTMENT OF ENVIRONMENTAL QUALITY’S 

TECHNICAL SUPPORT DOCUMENT 

FOR THE DEPARTMENT’S 

PROPOSED BOUNDARY RECOMMENDATION 

FOR THE 2008 REVISION OF THE NAAQS FOR LEAD 

Prepared for: 

ASARCO LLC 

5285 EAST WILLIAMS CIRCLE, SUITE 2000 

TUCSON, ARIZONA 85711-7711 

Prepared By: 

ZEPHYR ENVIRONMENTAL CORPORATION

10420 LITTLE PATUXENT PARKWAY, SUITE 320 

COLUMBIA, MARYLAND 21044 

NOVEMBER 10, 2009 
REVIEW OF ADEQ’S TSD FOR PROPOSED LEAD NAAQS BOUNDARY RECOMMENDATION

ZEPHYR ENVIRONMENTAL CORPORATION 1 

CONTENTS 

EXECUTIVE SUMMARY .............................................................................................................. 3

1.0 BACKGROUND ................................................................................................................... 5

2.0 ISSUES IDENTIFIED ........................................................................................................... 7

2.1 EXCEPTIONAL EVENTS ................................................................................................. 7

2.1.1 Dates Deemed to Have Exceptional Wind Speeds ...................................... 10

2.1.2 Impact of Removing Exceptional Events ...................................................... 12

2.2 SUITABILITY OF MONITOR LOCATION .......................................................................... 13

2.3 QUALITY ASSURANCE ................................................................................................ 15

2.4 DATA COMPLETENESS (VALIDATION OF THREE-MONTH MEANS) .................................. 16

2.5 UNCERTAINTY REGARDING DESIGN VALUE ................................................................. 21
REVIEW OF ADEQ’S TSD FOR PROPOSED LEAD NAAQS BOUNDARY RECOMMENDATION

ZEPHYR ENVIRONMENTAL CORPORATION 2 

APPENDICES 

Appendix A Hayden Air Quality Monitoring Results, Received from EPA on September 23, 

2009 

 
REVIEW OF ADEQ’S TSD FOR PROPOSED LEAD NAAQS BOUNDARY RECOMMENDATION

ZEPHYR ENVIRONMENTAL CORPORATION 3 

EXECUTIVE SUMMARY

In a September 28, 2009 document entitled “Arizona Air Quality Designations Technical Support 

Document Boundary Recommendation for the 2008 Revision to the National Ambient Air Quality 

Standard for Lead” (TSD), the Arizona Department of Environmental Quality (ADEQ) made a 

proposal that the Governor should recommend to the U.S. Environmental Protection Agency 

(EPA) that portions of Gila and Pinal Counties (hereinafter the Hayden area) be designated as 

being in nonattainment of the National Ambient Air Quality Standard (NAAQS) for lead. The 

ADEQ’s proposal is based on air monitoring data collected in the Hayden area as part of a 

remedial investigation in a CERCLA proceeding between the EPA, ADEQ and ASARCO LLC 

(Asarco). 

Asarco retained Zephyr Environmental Corporation (Zephyr) to review the TSD underlying the 

ADEQ’s proposal. 

 

Zephyr’s review identified the following issues: 

• Some of the monitored lead values relied upon in the TSD are associated with 

“exceptional events” under 40 CFR Part 50 and ADEQ guidance and should therefore 

not be counted toward determining whether the Hayden area is in nonattainment of the 

NAAQS for lead. When these “exceptional events” values are excluded there are no 

monitored values above the NAAQS. 

• The Hayden monitor is located on top of the Town of Hayden maintenance building. 

Given the soldering/welding activities and vehicle traffic that take place at the 

maintenance yard, the potential exists for contamination of the samples obtained using 

the monitor. 

• The Quality Assurance (QA) plan governing the Hayden monitor and the results of the 

various tests and calibrations required under the quality assurance rules governing 

ambient air monitors were not available at the time of Zephyr’s review. As of the date of 

the TSD, the ADEQ had not reviewed information on the required quality assurance 

checks of the Hayden monitor, and it remains uncertain whether such checks occurred. 

This calls into question the validity of the data generated using the monitor. 

• In support of the ADEQ’s proposal, the TSD (at Table 4-1) compares 3-month means to 

the NAAQS. However, the TSD does not demonstrate the ADEQ validated the 3-month 

means according to 40 CFR Part 50, Appendix R Section 4(c) procedures. If these 

procedures were followed, it would be found that all the 3-month means above the lead 

NAAQS do not meet the specific 75% data completeness requirement. 

• The Design Value (i.e., the single mean concentration that is required under the rules to 

be compared to the NAAQS to demonstrate attainment or nonattainment) was not 

clearly identified or adequately discussed in the TSD. 

Based on these findings, the proposed nonattainment designation for the Hayden area is 

unwarranted. In order to make a defensible proposal of a nonattainment designation, more 

representative, quality controlled and quality assured data are needed, and the data need to be 
REVIEW OF ADEQ’S TSD FOR PROPOSED LEAD NAAQS BOUNDARY RECOMMENDATION

ZEPHYR ENVIRONMENTAL CORPORATION 4 

evaluated properly under the rules at 40 CFR Part 50, Appendix R and ADEQ guidance, 

including the effect of exceptional events and data validation. 

 
REVIEW OF ADEQ’S TSD FOR PROPOSED LEAD NAAQS BOUNDARY RECOMMENDATION

ZEPHYR ENVIRONMENTAL CORPORATION 5 

1.0 BACKGROUND

ASARCO LLC (Asarco) conducts beneficiation and smelting of copper ores at its Ray ComplexHayden Operations in Hayden, Arizona, approximately 80 miles east-southeast of Phoenix and 

60 miles north of Tucson. In April 2008 a CERCLA Administrative Settlement Agreement and 

Order on Consent (Settlement Agreement) was entered into by the U.S. Environmental 

Protection Agency (EPA), the Arizona Department of Environmental Quality (ADEQ) and 

Asarco. One of the stipulations of the Settlement Agreement was that Asarco conduct a 

Remedial Investigation/Feasibility Study (RI/FS), which among other things called for the 

continuation of air quality monitoring that the EPA had already begun in the Hayden area. That 

monitoring addressed several air pollutants, one of which was lead. 

On November 12, 2008 the EPA revised the National Ambient Air Quality Standard (NAAQS) for 

lead.1

 The revised NAAQS was established at 0.15 μg/m3 on a rolling three-month averaging 

period. 

On September 28, 2009 the ADEQ completed a Technical Support Document2

 (TSD) in which it 

proposed that the Governor recommend to the EPA a designation of portions of Gila and Pinal 

Counties as being in nonattainment of the revised NAAQS for lead. The proposed 

nonattainment area is presented in Figure 1-1. 

Asarco retained Zephyr Environmental Corporation (Zephyr) to review the ADEQ’s proposal. In 

its review, Zephyr evaluated both the technical and the regulatory merits of the ADEQ’s 

proposal. 

This report documents Zephyr’s findings. 

 

1

 73 Fed. Reg. 66964. 

2

 “Arizona Air Quality Designations Technical Support Document Boundary Recommendation for the 2008 

Revision to the National Ambient Air Quality Standard for Lead,” Air Quality Division, ADEQ. 
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Figure 1-1 

ADEQ Proposed Lead Nonattainment Area for Hayden, Arizona 

(taken from ADEQ’s TSD)
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2.0 ISSUES IDENTIFIED 

Zephyr identified several issues which, to varying degrees, call into question the ADEQ’s 

proposal of the Hayden area as nonattainment for lead. These issues are elaborated upon 

below. 

2.1 EXCEPTIONAL EVENTS

40 CFR Part 50 defines an exceptional event as “an event that affects air quality, is not 

reasonably controllable or preventable, is an event caused by human activity that is unlikely to 

recur at a particular location or a natural event...” 40 CFR 50.14(c)(3)(iv) presents the criteria 

that must be met for an event to be deemed exceptional under this rule: 

• The exceptional event is a cause of the monitored value, 

• The event in question is beyond normal historical fluctuations, and 

• There would not have been an exceedance of the NAAQS without this event. 

Should a monitored value be excluded for being associated with an exceptional event, 40 CFR 

50.14(b) stipulates that those excluded data are not to be included in a determination of an 

exceedance of a NAAQS. 

On October 15, 2009, the ADEQ issued a 

report entitled “The Impact of Exceptional 

Events ‘Unusual Winds’ on PM10

Concentrations in Arizona”3

 that provides 

guidance as to how to determine what 

constitutes an exceptional event in terms of 

winds. The report considered historical 

environmental and meteorological data, 

including data from Hayden. One of the 

conclusions of the report was as follows: 

For exceptional events purposes, “unusual winds” can be defined as any wind that has 

the ability to create wind blown dust. Literature and data from monitors indicate that the 

phenomenon of blowing dust can occur over a broad range, but generally is associated 

with hourly averaged wind speeds that are above 10 miles per hour, which are 

commonly associated with wind gusts over 20 miles per hour. 

As a first step Zephyr reviewed both lead concentrations and wind speeds for the entire year of 

2008 to identify any potential relationship between the two. As shown in Figure 2-1, there 

clearly is a correlation between three-month average lead concentrations observed at the 

 

3

 “The Impact of Exceptional Events ‘Unusual Winds’ on PM10 Concentrations in Arizona”, ADEQ Air 

Quality Division (October 15, 2009). 

Recent ADEQ guidance supports the

determination that three days in late

2008 are “exceptional events.”  When

they are removed, the revised Design

Concentration is below the NAAQS.
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Hayden monitor and three-month average wind speeds observed at the same monitor. Both the 

three-month average lead concentrations and wind speeds are at their lowest in the spring, then 

attain an intermediate maximum in June, and then reach their greatest values in the late fall. 

Figure 2-1 

Average Lead Concentrations and Wind Speed Observed at Hayden Monitor, 2008

A single short-term (e.g., an hour) concentration at a monitor that is extraordinarily high can lead 

to a high 24-hr concentration (even with the rest of the 24-hr period having fairly low impacts). 

This is illustrated, by way of example, by the data in Figure 2-2, taken from a continuous PM10

monitor located at the University of Texas at El Paso (EPA ID # 481410037). 

0.000

0.050

0.100

0.150

0.200

Pb Concentration (ug/m3)

Rolling 3‐Month Lead Averages

Hayden Monitor, 2008

4.0

4.5

5.0

5.5

6.0

Wind Speed (mph)

Rolling 3‐Month Average Wspd

Hayden Monitor, 2008
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Figure 2-2 

Example of One Hour of Elevated Concentration Leading to High 24-hr Concentration

As shown in the figure above, the vast majority of the hourly PM10 concentrations on this day 

are below the 24-hr NAAQS of 150 μg/m3

. However, the overall daily average is radically 

affected by several very high individual hourly monitored values (although not indicated on this 

plot, the high concentrations were associated with winds in excess of 10 mph), ultimately 

leading to a 24-hr concentration greater than the NAAQS. 

Therefore, a day that has a single hourly average wind speed of 10 mph or greater is a 

candidate for being an exceptional event (note that this discussion focuses on average winds, 

not a wind gust which would be higher than the hourly average) in the context of 40 CFR 

50.14(c)(3)(iv). However, for the sake of conservatism Zephyr decided to focus only on days 

with more than one hour of average wind speeds greater than 10 mph. 

An examination of the meteorological data gathered at Hayden during the months of July 

through November, inclusive, in 2008 (the months whose data are associated with all calculated 

lead NAAQS exceedances as presented in the TSD) revealed that only three days had more 

than one average hourly wind speed greater than 10 mph. Details on these days are presented 

below (note that the plots show both average hourly winds as well as average 30-minute winds). 

 
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2.1.1 Dates Deemed to Have Exceptional Wind Speeds 

2.1.1.1 August 5, 2008 

On August 5, 2008 there were two hourly average wind speeds at 

the Hayden monitor in excess of 10 mph. These two wind 

speeds occurred at 7:00 PM and 8:00 PM (with the 6:00 PM wind 

speed being 9.6 mph). Therefore, this day experienced a 

concentrated period of exceptionally high winds in the evening. 

More information concerning the winds of that day is presented in 

the table to the right. 

Figure 2-3 

Hayden Monitor Average 30-Minute and Hourly Wind Speeds 

August 5, 2008

 

0.0

2.0

4.0

6.0

8.0

10.0

12.0

14.0

16.0

18.0

20.0

1:00 AM2:00 AM3:00 AM4:00 AM5:00 AM6:00 AM7:00 AM8:00 AM9:00 AM

10:00 AM11:00 AM

12:00 PM

1:00 PM2:00 PM3:00 PM4:00 PM5:00 PM6:00 PM7:00 PM8:00 PM9:00 PM

10:00 PM11:00 PM

12:00 AM

Wind Speed (mph)

Wind Speed, Hayden, Arizona

August 5, 2008

30‐min Wspd

Hrly Wspd

August 5, 2008 Wind Speed 

Information 

Maximum 30-min 

Wind Speed 

18.6 mph 

Maximum Hourly 

Wind Speed 

16.1 mph 
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2.1.1.2 September 30, 2008 

On September 30, 2008 there were five hourly average wind 

speeds at the Hayden monitor in excess of 10 mph. These five 

wind speeds occurred between 6:00 AM and 11:00 AM, with the 

8:00 AM wind speed being just below 10 mph. Therefore, this 

day experienced a concentrated period of exceptionally high 

winds in the morning. More information concerning the winds of 

that day is presented in the table to the right. 

Figure 2-4 

Hayden Monitor Average 30-Minute and Hourly Wind Speeds 

September 30, 2008

2.1.1.3 October 22, 2008 

On October 22, 2008 there were ten hourly average wind speeds 

at the Hayden monitor in excess of 10 mph. Eight of these wind 

speeds occurred between 10:00 AM and 5:00 PM (note the 9:00 

AM wind speed was 9.9 mph), with the other two occurring at 

11:00 PM and midnight. Therefore, this day experienced a 

concentrated period of exceptionally high winds throughout a 

substantial portion of the day. More information concerning the 

winds of that day is presented in the table to the right. 

0.0

2.0

4.0

6.0

8.0

10.0

12.0

14.0

1:00 AM2:00 AM3:00 AM4:00 AM5:00 AM6:00 AM7:00 AM8:00 AM9:00 AM

10:00 AM11:00 AM

12:00 PM

1:00 PM2:00 PM3:00 PM4:00 PM5:00 PM6:00 PM7:00 PM8:00 PM9:00 PM

10:00 PM11:00 PM

12:00 AM

Wind Speed (mph)

Wind Speed, Hayden, Arizona

September 30, 2008

30‐min Wspd

Hrly Wspd

September 30, 2008 Wind 

Speed Information 

Maximum 30-min 

Wind Speed 

12.9 mph 

Maximum Hourly 

Wind Speed 

12.3 mph 

October 22, 2008 Wind Speed 

Information 

Maximum 30-min 

Wind Speed 

18.5 mph 

Maximum Hourly 

Wind Speed 

18.1 mph 
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Figure 2-5 

Hayden Monitor Average 30-Minute and Hourly Wind Speeds 

October 22, 2008

2.1.2 Impact of Removing Exceptional Events 

As mentioned above, 40 CFR 50.14(b) states that if a monitored value is deemed to be caused 

by an exceptional event that that value is not to be included in the determination of an 

exceedance of the NAAQS. Accordingly, the three NAAQS exceedances identified in Table 4-1 

of the ADEQ’s TSD were recalculated without the inclusion of data from the three days identified 

above. The revised results are presented below. 

 

0.0

2.0

4.0

6.0

8.0

10.0

12.0

14.0

16.0

18.0

20.0

1:00 AM2:00 AM3:00 AM4:00 AM5:00 AM6:00 AM7:00 AM8:00 AM9:00 AM

10:00 AM11:00 AM

12:00 PM

1:00 PM2:00 PM3:00 PM4:00 PM5:00 PM6:00 PM7:00 PM8:00 PM9:00 PM

10:00 PM11:00 PM

12:00 AM

Wind Speed (mph)

Wind Speed, Hayden, Arizona

October 22, 2008

30‐min Wspd

Hrly Wspd
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Table 2-1 Three-Month Rolling Average Lead Concentrations During Late 2008 

Period 

Three-Month Rolling Average Lead Concentration (μg/m3

) 

Originala Revisedb

July-September 2008 0.172 0.096 

August-October 2008 0.184 0.079 

September-November 2008 0.152 0.047 

a) Calculated with data as presented in TSD. 

b) Calculated with data as presented in TSD, with the exception of data for August 5, 

September 30, and October 22 being removed. 

As shown in the table above, the exclusion of data from these three days—days that according 

to ADEQ guidance have exceptional wind speeds—results in no lead concentrations greater 

than the NAAQS. 

2.2 SUITABILITY OF MONITOR LOCATION

The Hayden monitor has been placed on the roof of the maintenance building at the Town of 

Hayden maintenance yard. The location of the maintenance yard is given in Figure 2-6, while 

Figure 2-7 shows the placement of the monitor on the roof. 

Figure 2-6 

Location of Hayden Maintenance Yard
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Figure 2-7 

View of Monitor on Roof of Town of Hayden Maintenance Building 

(looking to the southeast)

Asarco spoke with Bob Larona, the Town of Hayden General Superintendent, to ascertain 

whether there are any activities that take place at the maintenance yard that could affect 

monitored lead concentrations at the roof of the maintenance building. Based on the 

conversation there are activities conducted at the yard that could affect lead concentrations at 

the roof. Those activities include soldering/welding (which could produce lead emissions) and 

vehicular traffic (which could disturb particulates on the ground in and around the maintenance 

building, leading to increased amounts of lead in the sampler). These activities occur 

throughout the week, not just for isolated periods. 

Given the activities at the maintenance yard and the frequency of those activities, the potential 

exists for lead concentrations to be monitored at elevated levels that are not representative of 

the overall area or an appropriately sited source-oriented monitor. If the goal of the Hayden 

monitor is to support a designation, then an alternative location should be considered.
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2.3 QUALITY ASSURANCE

40 CFR Part 58 Appendix A establishes quality assurance (QA) requirements for air monitoring 

data collected for State and Local Air Monitoring Stations (SLAMS) network, Special Purpose 

Monitoring (SPM), or for purposes of Prevention of 

Significant Deterioration (PSD) permitting. While the 

Hayden monitor apparently was not established under 

any of these programs—it was established pursuant to 

a remedial investigation in a CERCLA proceeding—

the data gathered at the Hayden monitor must 

nonetheless meet the QA requirements of 40 CFR 58 

Appendix A if they are to be used to define a 

nonattainment area. 

The QA requirements specified by 40 CFR 58 

Appendix A are presented in Table 2-2. 

Table 2-2 QA Requirements of 40 CFR 58 Appendix A 

QA Requirement Citation Description 

Quality System Requirements 40 CFR 58, Appendix A 

Section 2 

Prescribes a means to manage 

quality of monitoring 

information; includes Quality 

Management Plan and Quality 

Assurance Project Plan 

Measurement Quality Check 

Requirements 

40 CFR 58, Appendix A 

Section 3 

Prescribes requirements for 

performing measurement quality 

checks to assess data quality; 

includes quarterly audits of 

sampling system 

Calculations for Data Quality 

Assessments 

40 CFR 58, Appendix A 

Section 4 

Prescribes calculations for 

assessing data quality; includes 

precision estimate, bias 

estimate, and flow rate 

calculation 

Reporting Requirements 40 CFR 58, Appendix A 

Section 5 

Prescribes reporting 

requirements for SLAMS and 

PSD monitoring 

Appendix D of the TSD is labeled “ADEQ Memo Certifying Air Quality Data for the Hayden 

Area” and contains an internal ADEQ memo prepared on August 13, 2009 from Jon Midgley to 

ADEQ has not reviewed the

QA procedures/information

for the data it used to

propose a nonattainment

designation for lead
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Ira Domsky. That memo states that “(i)nformation about quality assurance checks performed on 

the samplers is not available at this time.”4

Zephyr, accordingly, has not been able to review the QA procedures applicable and QA 

information required to be generated for the Hayden monitor under 40 CFR Part 58 Appendix A. 

Without the procedures/information, Zephyr cannot determine whether the data meet the QA 

requirements, and neither can the ADEQ. The ADEQ should review the procedures and 

information required under 40 CFR Part 58 Appendix A for the monitor, before it makes a 

proposal to designate an area nonattainment based on data from the monitor. 

2.4 DATA COMPLETENESS (VALIDATION OF THREE-MONTH MEANS) 

Section 4.1 of the TSD briefly discusses the three consecutive three-month means that are 

greater than the lead NAAQS. The sampling dataset on which the three-month means 

assessment is based spans data collected at the Hayden monitor from November 2007 through 

November 2008. Table 2-3 gives the three-month means of interest. 

Table 2-3 Three-month Means (Lead) Given in Table 4-1 of ADEQ Technical Support 

Document 

3-month Period 3-month Mean (μg/m3

) 

July, August, September 2008 0.172 

August, September, October 2008 0.184 

September, October, November 2008 0.152 

According to 40 CFR 50, Appendix R Section 1(c), the design value upon which lead NAAQS 

compliance is based is selected, according to procedures specified in Appendix R, from among 

the valid three-month mean concentrations for the design value period. Validity of the threemonth mean is determined following procedures given in 40 CFR 50, Appendix R Section 4(c). 

According to 40 CFR 50, Appendix R Section 4(c)(i), “A 3-month parameter mean is considered 

valid (i.e., meets the completeness requirements) if the average capture rate of the three 

constituent monthly means (i.e., the 3-month data capture rate) is greater than or equal to 75 

percent.” 

The first step in determining the validity of a three-month mean is to calculate the relevant 

monthly capture rates. According to 40 CFR 50, Appendix R Section 4(c)(i), 

Monthly data capture rates (expressed as a percentage) are specifically calculated as 

the number of creditable samples for the month (including any make-up samples taken 

the subsequent month for missed samples in the month in question, and excluding any 

 

4

 Several requests apparently have been made to the EPA and its contractors for quality assurance 

documentation. Asarco has not yet received copies of any responses to those requests. 
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make-up samples taken in the month in question for missed samples in the previous 

month) divided by the number of scheduled samples for the month, the result then 

multiplied by 100 but not rounded. 

Creditable samples, according to 40 CFR 50, Appendix R Section 1(c), “...are samples that are 

given credit for data completeness. They include valid samples collected on required sampling 

days and valid ‘make-up’ samples taken for missed or invalidated samples on required sampling 

days.” 

To calculate the monthly data capture rate properly one must identify the required sampling 

days in order to identify creditable samples (the number of which is the numerator of the 

monthly capture rate) and to determine the number of scheduled samples (the denominator of 

the monthly capture rate). Required sampling days are equivalent to scheduled sampling days. 

According to 40 CFR 50, Appendix R Section 1(c), “Scheduled sampling day means a day on 

which sampling is scheduled based on the required sampling frequency for the monitoring site, 

as provided in section 58.12 of this chapter.” 40 CFR 58.12(b) provides “For Pb manual 

methods, at least one 24-hour sample must be collected every 6 days except during periods or 

seasons exempted by the Regional Administrator.” More importantly, 40 CFR 50, Appendix R 

confirms this scheduled sampling frequency by explicitly specifying the every sixth day 

frequency under Section 4(c)(i), that is, “For purposes of assessing data capture, Pb-TSP and 

Pb-PM10 data collected before January 1, 2009 will be treated with an assumed scheduled 

sampling frequency of every sixth day.” 

Since a specific list of scheduled sampling days was not available for the Hayden monitor, the 

scheduled sampling days were determined by examining the monitoring data collected at the 

Hayden monitor given in Appendix A of the TSD. Even though the focus of the validity 

assessment is the three consecutive three-month periods near the end of 2008 (including the 

months of July 2008 through November 2008, inclusive), Zephyr reviewed the entire monitoring 

record (November 13, 2007 to November 30, 2008) as provided to establish patterns in 

sampling and sampling frequency in order to identify scheduled sampling days. Table 2-4 is the 

result of this review. The table indicates determined scheduled sampling days (double-lined, 

bordered boxes). The table also indicates when monitored samples were collected. Specifically, 

the table indicates scheduled samples (red X’s) and extra samples (blue X’s). Sample 

indicators with a light green filled background correspond to collected samples that were 

invalidated or rejected by the monitoring contractor. 
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Table 2-4 Determined Scheduled Sample Days 
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The process of determining the scheduled sampling days was as follows (also, see Table 2-4). 

From the beginning of this dataset record through April 5, 2008 there is a clear, every sixth day 

sampling pattern based on the actual dates of sample collection. The only exception to this 

pattern is the three samples collected between March 14, 2008 and March 26, 2008, inclusive 

(see black X’s in Table 2-4). These three samples are collected every sixth day, but the 

sampling does not fall into the regular scheduled pattern. Note that the Technical 

Memorandum, which is Appendix A of the TSD, states that extra samples began to be collected 

(three days after the scheduled samples) after March 28, 2008. However, extra sampling three 

days after scheduled sampling was not apparent until April 2008. Then, around April 11/12, 

2008 the actual sample collection seems to indicate a shift in sampling pattern, as the 

scheduled pattern moves ahead by one day. This “new” pattern continues into early May 2008 

(around May 6/7, 2008 based on an extra sample collected on May 10, 2008) when the actual 

sample collection seems to indicate another shift in sampling pattern. Again, the scheduled 

pattern moves ahead by one day. This “new” pattern continues until the end of the dataset 

record. The only exception to this pattern is the samples collected in September 2008 through 

early October 2008 (through October 12, 2008). These samples are collected every sixth day 

but on a shifted schedule. However, because these samples are collected every sixth day with 

no extra samples collected (during a period when extra samples also are supposed to be 

collected three days after the scheduled sample), these actual samples are assumed to be 

collected on scheduled sampling days. 

During the period of interest of July 2008 through November 2008, there are seven scheduled 

samples that are missing, and four scheduled samples that are invalid (i.e., rejected). In other 

words only 56% [(25-11)/25] of the scheduled samples are available during this period. The 

Technical Memorandum states that “...due to apparent power surging issues at the Hayden 

station, 13 samples (October through December 2008) were not collected.” It goes on to state 

that “...the resulting data set is considered sizable enough for evaluation purposes in this TM.” 

However, this is a subjective opinion and did not include a strict data validation following the 

procedures under 40 CFR 50, Appendix R Section 4(c). 

40 CFR 50, Appendix R Section 4(c)(i) allows make-up samples to replace missed or 

invalidated required scheduled samples. However, the dataset record does not indicate any 

make-up samples were collected. Only extra samples are indicated. Extra samples, according 

to 40 CFR 50, Appendix R section 1(c), “...are non-creditable samples. They are daily values 

that do not occur on scheduled sampling days and that can not be used as ‘make-up samples’ 

for missed or invalidated scheduled samples.” Therefore, the creditable samples are the valid, 

samples collected on the scheduled sampling days. Table 2-5 presents the number of 

creditable samples, the number of scheduled samples and the calculated monthly data capture 

rates (i.e., number of creditable samples divided by number of scheduled samples, multiplied by 

100 but not rounded) for the months of July 2008 through November 2008. 

 
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Table 2-5 Creditable Samples, Scheduled Sampling Days and Capture Rates by 

Month 

Month 

No. of Creditable 

Samples 

No. of Scheduled 

Samples 

Capture Rate 

(%) 

July 2008 4 5 80 

August 2008 3 5 60 

September 2008 4 5 80 

October 2008 2 5 40 

November 2008 1 5 20 

Table 2-6 presents the three-month data capture rates for the time periods of interest. 

Table 2-6 Three-Month Data Capture Rates by Time Period 

Time Period 3-month Capture Rate (%) 

July, August, September 2008 73 

August, September, October 2008 60 

September, October, November 2008 47 

According to 40 CFR 50, Appendix R Section 4(c)(i), “The three-month data capture rate is the 

sum of the three corresponding unrounded monthly data capture rates divided by three (3) and 

the result rounded to the nearest integer (zero decimal places).” As an example, the calculated 

three-month data capture rate for the July, August, 

September 2008 period is 73% or [(80+60+80)/3]. 

Because the three-month data capture rates are less 

than 75%, the corresponding three-month lead means 

(see Table 2-3) are considered not valid (i.e., they do 

not meet the data completeness requirements of 40 

CFR 50, Appendix R Section 4(c)(i). 

However, according to 40 CFR 50, Appendix R Section 4(c)(ii), “A 3-month parameter mean 

that does not have at least 75 percent data capture and thus is not considered valid under 

4(c)(i) shall be considered valid (and complete) if it passes either of the two following ‘data 

substitution’ tests, one such test for validating an above NAAQS-level (i.e., violating) 3-month 

Pb-TSP or Pb-PM10 mean (using actual ‘low’ reported values from the same site at about the 

same time of the year (i.e., in the same month) looking across three or four years),...” 

The three-month means of interest are above the NAAQS level. Therefore, the “data 

substitution” test of interest is the above NAAQS-level test. The above NAAQS-level test, 

according to 40 CFR 50, Appendix R Section 4(c)(ii), is as follows: 

Data substitution will be done in each month of the 3-month period that has less than 75 

percent data capture; monthly capture rates are temporarily rounded to integers (zero 

The 3­month capture rates

are below the 75%

completeness threshold.
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decimals) for this evaluation. If by substituting the lowest reported daily value for that 

month (year non-specific; e.g., for January) over the 38-month design value period in 

question for missing scheduled data in the deficient months (substituting only enough to 

meet the 75 percent data capture minimum), the computation yields a recalculated test 

3-month parameter mean concentration above the level of the standard, then the 3-

month period is deemed to have passed the diagnostic test and the level of the standard 

is deemed to be exceeded in that 3-month period. 

Following the above NAAQS-level diagnostic test would require substitution of one missing 

sample in August 2008, two missing/invalid samples in October 2008 and five missing/invalid 

samples in November 2008. All reported monitoring data at the Hayden Monitoring Station 

(starting October 22, 2006) through the end of 2008 were reviewed to identify the lowest 

reported daily values for the months of interest. According to 40 CFR 50, Appendix R Section 

4(c )(ii), “..substitution is permitted only if there are available data points from which to identify 

the high or low 3-year month-specific values, specifically if there are at least 10 data points from 

at least two of the three (or four for November and December) possible year-months.” This 

criterion is met for the months of August and November, but not for the month of October. Only 

7 data points from two of the three possible year-months (5 reported values in October 2007 

and 2 reported values in October 2008) are available. Therefore, the substitution is not 

permitted for the month of October, and, thus, the diagnostic test cannot be performed for the 

August, September, October 2008 and September, October, November 2008 time periods. For 

these time periods the data completeness requirements (at least 75% data capture) are not met 

and the three-month means are considered not valid. 

The data substitution diagnostic test was performed for the July, August, September 2008 time 

period. One missing scheduled data for August 2008 was substituted with the lowest reported 

value for the month of August. The lowest reported lead value for the month of August is 

0.0142 μg/m3

 collected on August 6, 2007. The recalculated July, August, September 2008 test 

three-month mean is 0.166 μg/m3

 [(0.0718 + 0.1387 + 0.2884)/3]. This value is above the level 

of the lead standard, thus the three-month period is deemed to have passed the diagnostic test. 

2.5 UNCERTAINTY REGARDING DESIGN VALUE

As defined in 40 CFR 50, Appendix R, the Design 

Value is the concentration “...that is compared to the 

NAAQS level to determine compliance; the design 

value for the Pb NAAQS is selected...from among the 

valid three-month (lead) arithmetic mean 

concentration(s)...” In practice it is the highest of the 

rolling three-month averages that are calculated. 

The TSD does not contain a discussion of the Design 

Value. A discussion of concentrations greater than the 

NAAQS is contained in Section 4.1 of the TSD; in that section it refers to Appendix A of the TSD 

The Design Value should be

clearly defined before

proposing to classify an area

as nonattainment.
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for more details pertaining to the monitoring results that confirm the Hayden area is in 

nonattainment for lead. 

Appendix A of the TSD is labeled as “EPA’s Air Quality Study of the Hayden Area,” and consists 

of a Technical Memorandum prepared on December 31, 2008 from CH2M Hill to John 

Hillenbrand of EPA. The Technical Memorandum includes a summary of monitoring conducted 

at Hayden and provides tables of all monitoring results (pollutant and meteorological) on a daily 

basis (Table 1 in Appendix A of the TSD contains the Hayden information). 

Following these detailed tables there is an individual page that presents a Design Value of 0.21 

μg/m3

 for lead for the Hayden monitor for the period 2006-2008. However, there is no 

explanation as to the derivation of this value; furthermore, a close inspection reveals that the 

data presented in Appendix A of the TSD do not support the 0.21 μg/m3

 value. 

Zephyr looked into this discrepancy further and ascertained that the Design Value of 0.21 μg/m3

may be based on data provided in electronic format by John Hillenbrand of EPA to Jack Garrity 

of Asarco on September 23, 2009 (these data are presented in the spreadsheet in Appendix A 

of this report). It is not clear the spreadsheet data have been vetted for exceptional events, 

quality assurance and data completeness. 

It is unclear, therefore, which, if any, dataset is appropriate to use. While the ADEQ apparently 

makes its proposal based on the data in Appendix A of the TSD, the TSD’s sole actual 

reference to a Design Value may rely on a completely different set of data which may or may 

not have undergone validation under the rules. The ADEQ should clearly establish and validate 

the Design Value for comparison to the NAAQS. Without a clearly established and properly 

validated Design Value a designation of nonattainment is not justified. 
REVIEW OF ADEQ’S TSD FOR PROPOSED LEAD NAAQS BOUNDARY RECOMMENDATION

ZEPHYR ENVIRONMENTAL CORPORATION 23 

APPENDIX A 

HAYDEN AIR QUALITY MONITORING DATA 

RECEIVED FROM EPA ON SEPTEMBER 23, 2009 
Result Qualifier NAAQS

Hayden 10/22/06 μg/m30.0024 * 0.15

Hayden 11/03/06 μg/m3

0.0266 0.15

Hayden 11/09/06 μg/m3

0.0141 0.15

Hayden 11/11/06 μg/m3

0.044 0.15

Hayden 11/21/06 μg/m30.5947 0.15

Hayden 11/27/06 μg/m3

0.0191 0.15

Hayden 12/03/06 μg/m3

0.1595 0.15

Hayden 12/09/06 μg/m3

Hayden 12/15/06 μg/m30.0329 J 0.15

Hayden 12/21/06 μg/m3

0.0027 * 0.15

Hayden 12/27/06 μg/m30.0143 0.15

Average 0.0834

Hayden 01/08/07 μg/m30.47 0.15

Hayden 01/14/07 μg/m3

0.0167 0.15

Hayden 01/20/07 μg/m3

0.0043 0.15

Hayden 01/26/07 μg/m30.0099 0.15

Hayden 02/01/07 μg/m3

0.005 0.15

Hayden 02/07/07 μg/m3

0.0103 0.15

Hayden 02/13/07 μg/m30.037 0.15

Hayden 02/19/07 μg/m30.0173 0.15

Hayden 02/25/07 μg/m30.0105 0.15

Hayden 03/03/07 μg/m3

0.1444 0.15

Hayden 03/09/07 μg/m3 R R 0.15

Hayden 03/15/07 μg/m30.032 0.15

Hayden 03/21/07 μg/m3

0.0885 0.15

Hayden 03/27/07 μg/m30.0227 0.15

Hayden 04/02/07 μg/m30.028 0.15

Hayden 04/20/07 μg/m3

0.0122 0.15

Hayden 04/26/07 μg/m30.0324 0.15

Hayden 05/02/07 μg/m3 R R 0.15

Hayden 05/08/07 μg/m30.0774 0.15

Hayden 05/14/07 μg/m3

0.0257 0.15

Hayden 05/20/07 μg/m30.0127 0.15

Hayden 05/26/07 μg/m3

0.0253 0.15

Hayden 06/01/07 μg/m3

0.046 0.15

Hayden 06/07/07 μg/m30.0048 0.15

Hayden 06/13/07 μg/m30.0238 0.15

Hayden 06/19/07 μg/m3

0.0298 0.15

Hayden 06/25/07 μg/m30.0299 0.15

Hayden 07/01/07 μg/m30.0382 0.15

Hayden 07/07/07 μg/m3 R R 0.15

Hayden 07/13/07 μg/m30.021 0.15

Hayden 07/19/07 μg/m3

0.0986 0.15

Hayden 07/25/07 μg/m3

0.0136 0.15

Hayden 07/31/07 μg/m30.0208 0.15

Hayden 08/06/07 μg/m3

0.0142 0.15

Lead

Location

Sample

Date Units

Page 1 of 4
Result Qualifier NAAQS

Lead

Location

Sample

Date Units

Hayden 08/12/07 μg/m30.0268 0.15

Hayden 08/18/07 μg/m3

0.0429 0.15

Hayden 08/24/07 μg/m3

0.0182 0.15

Hayden 08/30/07 μg/m3

0.517 0.15

Hayden 09/05/07 μg/m30.0294 0.15

Hayden 09/11/07 μg/m3

0.8362 0.15

Hayden 09/17/07 μg/m3

0.0803 0.15

Hayden 09/23/07 μg/m30.0033 0.15

Hayden 09/29/07 μg/m30.0273 0.15

Hayden 10/05/07 μg/m3

0.0035 0.15

Hayden 10/11/07 μg/m30.046 0.15

Hayden 10/17/07 μg/m30.0194 0.15

Hayden 10/22/07 μg/m30.5156 0.15

Hayden 10/27/07 μg/m3

0.0242 0.15

Hayden 11/01/07 μg/m3

0.0202 0.15

Hayden 11/07/07 μg/m30.3183 0.15

Hayden 11/13/07 μg/m30.0049 0.15

Hayden 11/19/07 μg/m3

0.042 0.15

Hayden 11/25/07 μg/m30.0538 0.15

Hayden 12/07/07 μg/m3

0.2119 0.15

Hayden 12/13/07 μg/m30.0944 0.15

Average 0.0838

Hayden 01/12/08 μg/m30.1487 0.15

Hayden 01/18/08 μg/m30.0613 0.15

Hayden 02/17/08 μg/m3

0.0291 0.15

Hayden 02/23/08 μg/m30.0081 0.15

Hayden 02/29/08 μg/m30.0764 0.15

Hayden 03/06/08 μg/m3

0.0697 0.15

Hayden 03/12/08 μg/m3 R R 0.15

Hayden 03/14/08 μg/m3

0.064 0.15

Hayden 03/20/08 μg/m30.0152 0.15

Hayden 03/26/08 μg/m3

0.0125 0.15

Hayden 03/30/08 μg/m30.0024 * 0.15

Hayden 04/05/08 μg/m3

0.0305 0.15

Hayden 04/12/08 μg/m3

0.4627 0.15

Hayden 04/15/08 μg/m30.059 0.15

Hayden 04/18/08 μg/m30.1272 0.15

Hayden 04/21/08 μg/m3

0.0299 0.15

Hayden 04/24/08 μg/m30.0097 0.15

Hayden 05/10/08 μg/m30.022 0.15

Hayden 05/13/08 μg/m30.1163 0.15

Hayden 05/16/08 μg/m30.288 0.15

Hayden 05/19/08 μg/m3

0.0236 0.15

Hayden 05/22/08 μg/m3

0.0166 0.15

Hayden 05/28/08 μg/m30.0361 0.15

Hayden 05/31/08 μg/m3

0.028 0.15

Page 2 of 4
Result Qualifier NAAQS

Lead

Location

Sample

Date Units

Hayden 06/03/08 μg/m30.0547 0.15

Hayden 06/06/08 μg/m3

0.0185 0.15

Hayden 06/09/08 μg/m3

0.0843 0.15

Hayden 06/12/08 μg/m3

0.0746 0.15

Hayden 06/15/08 μg/m30.1255 0.15

Hayden 06/18/08 μg/m3

0.033 0.15

Hayden 06/21/08 μg/m3

0.1123 0.15

Hayden 07/09/08 μg/m30.3432 0.15

Hayden 07/12/08 μg/m30.0062 0.15

Hayden 07/15/08 μg/m3

0.0191 0.15

Hayden 07/18/08 μg/m30.047 0.15

Hayden 07/21/08 μg/m30.0205 0.15

Hayden 07/24/08 μg/m30.0731 0.15

Hayden 07/27/08 μg/m3

0.0011 0.15

Hayden 07/30/08 μg/m3

0.0132 0.15

Hayden 08/02/08 μg/m30.0347 0.15

Hayden 08/05/08 μg/m30.1629 0.15

Hayden 08/08/08 μg/m3

0.457 0.15

Hayden 08/11/08 μg/m30.0417 0.15

Hayden 08/14/08 μg/m3

0.1646 0.15

Hayden 08/17/08 μg/m30.1981 0.15

Hayden 08/20/08 μg/m3

0.0363 0.15

Hayden 09/12/08 μg/m30.0136 0.15

Hayden 09/18/08 μg/m30.0462 0.15

Hayden 09/24/08 μg/m3

0.1263 0.15

Hayden 09/30/08 μg/m30.9676 0.15

Hayden 10/06/08 μg/m3

0.02 0.15

Hayden 10/12/08 μg/m3

0.0234 0.15

Hayden 10/22/08 μg/m3

0.1968 0.15

Hayden 10/25/08 μg/m3

0.042 0.15

Hayden 10/28/08 μg/m30.3002 0.15

Hayden 11/09/08 μg/m3

0.0887 0.15

Hayden 11/12/08 μg/m3

0.0071 0.15

Hayden 11/21/08 μg/m3

0.984 0.15

Hayden 11/24/08 μg/m3

0.111 0.15

Hayden 11/27/08 μg/m30.1731 0.15

Hayden 11/30/08 μg/m3

0.0328 0.15

Hayden 12/06/08 μg/m30.0113 0.15

Hayden 12/12/08 μg/m30.1094 0.15

Hayden 12/15/08 μg/m30.1166 0.15

Hayden 12/27/08 μg/m30.0944 0.15

Hayden 12/30/08 μg/m30.0115 0.15

Average 0.1128

Hayden 01/02/09 μg/m30.0174 0.15

Hayden 01/19/09 μg/m30.1583 0.15

Hayden 02/01/09 μg/m3

0.1483 0.15

Page 3 of 4
Result Qualifier NAAQS

Lead

Location

Sample

Date Units

Hayden 02/04/09 μg/m30.9647 0.15

Hayden 02/06/09 μg/m3

0.0433 0.15

Hayden 02/12/09 μg/m3

0.0109 0.15

02/18/09

Hayden 02/20/09 μg/m30.0567 0.15

02/24/09

Hayden 02/26/09 μg/m30.1353 0.15

03/02/09

Hayden 03/04/09 μg/m30.0253 0.15

03/08/09

Hayden 03/10/09 μg/m30.1507 0.15

Hayden 03/13/09 μg/m30.0706 0.15

03/14/09

Hayden 03/19/09 μg/m30.0937 0.15

03/20/09

Hayden 03/26/09 μg/m30.0807 0.15

Hayden 04/01/09 μg/m30.1023 0.15

Hayden 04/07/09 μg/m30.4633 0.15

Hayden 04/13/09 μg/m30.0174 0.15

Hayden 04/19/09 μg/m3

0.0455 0.15

Hayden 04/25/09 μg/m3

0.0226 0.15

Hayden 05/01/09 μg/m30.0645 0.15

Hayden 05/07/09 μg/m3

0.0299 0.15

Hayden 05/13/09 μg/m30.0913 0.15

Hayden 05/19/09 μg/m30.0249 0.15

Hayden 05/25/09 μg/m3

0.0050 0.15

Hayden 05/31/09 μg/m30.0056 0.15

Hayden 06/06/09 μg/m3

0.0040 0.15

Hayden 06/12/09 μg/m30.0039 0.15

Hayden 06/18/09 μg/m3

0.0083 0.15

Hayden 06/24/09 μg/m30.0102 0.15

Average 0.1020

Maximum 0.9647

* = The result is less than three times the level of uncertainty.

J = Estimated value

NA = Not available

R = Rejected due to filter damage

Page 4 of 4
1

Appendix G 

ADEQ’s Response to the Zephyr Report
This page is intentionally blank. 
Response to ASARCO Consultant Zephyr Environmental Corporation Report 

Review of Arizona Department Of Environmental Quality’s Technical Support Document 

for The Department’s Proposed Boundary Recommendation 

for the 2008 Revision of the NAAQS for Lead (November 10, 2009)

December 9, 2009∗

Zephyr Environmental Corporation (ZEC) raised the following issues regarding the technical basis of the 

recommended nonattainment area designation for the Hayden-Winkelman area: 

“ ... 

• Some of the monitored lead values relied upon in the TSD are associated with 

“exceptional events” under 40 CFR Part 50 and ADEQ guidance and should therefore 

not be counted toward determining whether the Hayden area is in nonattainment of the 

NAAQS for lead. When these “exceptional events” values are excluded there are no 

monitored values above the NAAQS. 

• The Hayden monitor is located on top of the Town of Hayden maintenance building. 

Given the soldering/welding activities and vehicle traffic that take place at the 

maintenance yard, the potential exists for contamination of the samples obtained using 

the monitor. 

• The Quality Assurance (QA) plan governing the Hayden monitor and the results of the 

various tests and calibrations required under the quality assurance rules governing 

ambient air monitors were not available at the time of Zephyr’s review. As of the date 

of the TSD, the ADEQ had not reviewed information on the required quality assurance 

checks of the Hayden monitor, and it remains uncertain whether such checks occurred. 

This calls into question the validity of the data generated using the monitor. 

• In support of the ADEQ’s proposal, the TSD (at Table 4-1) compares 3-month means 

to the NAAQS. However, the TSD does not demonstrate the ADEQ validated the 3-

month means according to 40 CFR Part 50, Appendix R Section 4(c) procedures. If 

these procedures were followed, it would be found that all the 3-month means above 

the lead NAAQS do not meet the specific 75% data completeness requirement. 

• The Design Value (i.e., the single mean concentration that is required under the rules to 

be compared to the NAAQS to demonstrate attainment or nonattainment) was not 

clearly identified or adequately discussed in the TSD.” 

Each of these concerns will be addressed in turn. 

Exceptional Events

ZEC prepared an analysis of rolling 3-month average wind speeds as part of the basis for claiming that the 

violations of the lead (Pb) National Ambient Air Quality Standard (NAAQS) were the results of 

exceptional events under the EPA exceptional events rule, 40 CFR 50.14. The claim is premised on an 

October 15, 2009, guidance document and analysis prepared by ADEQ to document “unusual winds” and 

their impact on ambient PM10 concentrations. In addition, they presented wind data for 3 different days 

where exceedances of the Pb NAAQS were measured and a generic assessment of the impact that wind 

has on hourly PM10 concentrations. While there may be some substance to their analysis, it was cursory 

and did not follow the requirements of either EPA rule or ADEQ’s technical criteria for demonstrating 

that the wind events were the cause of the exceedances, were beyond normal historical fluctuations, and 

that the exceedances would not have occurred without the event (their paraphrasing of 40 CFR 

50.14(c)(3)(iv)). Their argument revolves solely around the statement in the ADEQ document that 

“blowing dust can occur ... with hourly averaged wind speeds that are above 10 miles per hour.” These 

 

∗

 This document is the substantially the same as the December 3, 2009 version, excepting that minor revisions were 

made to pp. 7 and 8 in the Appendix. 
Response to Zephyr Report on Pb Nonattainment Page 2 

December 9, 2009 

demonstrations are inadequate to document and justify that the events were exceptional and should be 

excluded from the record for demonstrating compliance with the Pb NAAQS: 

• The quotation from the ADEQ document was taken out of context with the full discussion of 

unusual winds with relation to blowing dust. While an hourly average of 10 mph is a demonstrated 

threshold for blowing dust, and also is unusual from the standpoint that it occurs less than 5% of 

the time, it is not necessarily an appropriate threshold for an exceptional event. ADEQ has and 

continues to base its demonstrations for exceptional events using maximum winds rather than 

hourly averages, unless it can be shown that the hourly average winds exceed 15 mph for 3 or more 

consecutive hours (See “Technical Criteria Document for Determination of Natural Exceptional 

Events For Particulate Matter Equal to or Less Than Ten Microns in Aerodynamic Diameter 

(PM10), May 31, 2000", available at www.azdeq.gov/environ/air/monitoring/monitor.html). 

• PM10 and Pb 24-hour average concentrations for the three Pb exceedance days addressed by ZEC 

were reported as follows: 

PM10 Conc. 

(μg/m3

) 

Pb Conc. 

(μg/m3) 

August 5, 2008 32.2 0.163 

September 30, 2008 56.8 0.968 

October 22, 2008 48.7 0.197 

Because these PM10 concentrations are well below the PM10 NAAQS of 150 μg/m3, it does not 

appear that these Pb exceedances are associated with significant blowing dust. 

• No causal relationship between the winds for these days and Pb concentrations was presented by 

ZEC. 

• The ADEQ Technical Criteria Document for Assessment of Natural and Exceptional Events 

requires an analysis consisting of the following issues be prepared for an exceptional event 

demonstration: 

1. Properly qualify and validate the air quality measurement to be flagged. 

2. Review suspected contributing sources 

3. Examine all air quality monitoring information. 

4. Examine the meteorological conditions before and during the event 

5. Perform a qualitative attribution to emission source(s). 

6. Estimation of contribution from source or event. 

7. Determination that a natural or exceptional event contributed to an exceedance. 

• In addition the requirement for an assessment report, the EPA Exceptional Events Rule requires 

that the demonstration also address the following specific components before concurrence by EPA 

can be expected: 

• There is a clear causal relationship between the event and the ambient concentration 

being flagged (40 CFR 51) 

• The event is associated with measured concentrations in excess of normal historical 

fluctuations, including background as required in 40 CFR 50.14(c)(3)(iii)(C) 

• There is a direct linkage between the measurements to be flagged and the event as 

required in 40 CFR 50.14(c)(3)(iii)(B) 

• There would have been no exceedances or violations but for the event as required in 40 

CFR 50.14(c)(3)(iii)(D) 

• All appropriate State Implementation Plan (SIP) control measures were in place during 

the event, demonstrating that the event “is not reasonably controllable or preventable” as 

required in 40 CFR 50.1(j) 

• The event affects air quality as required in 40 CFR 50.1(j) 
Response to Zephyr Report on Pb Nonattainment Page 3 

December 9, 2009 

• The finalized document and any comments received were submitted to EPA to satisfy the 

requirements for public participation required in 40 CFR 50.14(c)(3)(i) 

• The forecasts/advisories requirement was satisfied as described in 40 CFR 51.930(a)(1). 

ADEQ has evaluated these claims more closely using all the criteria listed above and does not find that 

ambient lead measurements were affected by exceptional events on any of the days identified in the 

comments. 

Suitability of Monitor Location

ZEC makes the claim that activities in and near the Town of Hayden Maintenance Yard are probable 

sources of Pb, either from welding and soldering at the Yard or from fugitive dust reintrained by traffic in 

and near the Yard. Two factors readily available in the data that ASARCO has had in their possession 

beginning in October 2007 countermand this claim: 

• ZEC provides no documentation on the frequency or intensity of potential Pb emitting activities at 

or near the site. 

• On only one day when the Pb NAAQS was exceeded does there appear to be evidence of a large 

amount of reintrained or windblown dust at this monitor. All but 5 of the 24 Pb exceedance days 

had PM10 concentrations greater than 50 μg/m3

, but on only one day was the PM10 concentration 

greater than 70 μg/m3

. On that one day, PM10 was barely above two-thirds of the NAAQS, at 100.3 

μg/m3

. The PM10 NAAQS is set at a 24-hour average of 150 μg/m3. 

• Figure 1 (below) demonstrates there is a very strong correlation between Pb and both arsenic (As) 

and copper (Cu) concentrations. Neither of these elements are associated with welding and 

soldering, and all three elements – Pb, As and Cu – are associated with copper smelter operations. 

Because the Maintenance Yard is in an area where the public has ready access and can breathe the air, it 

is very well suited to measure population exposure to air contaminants, including Pb. 
Response to Zephyr Report on Pb Nonattainment Page 4 

December 9, 2009 

Figure 1 

Scatterplot of Pb with As and Cu

Hayden Maint. Yard Monitor, Nov. 2006 thru June 2009

y = 4.0615x + 0.1859

R2

 = 0.737

y = 0.2224x

R2

 = 0.8396

0.0

0.5

1.0

1.5

2.0

2.5

3.0

3.5

4.0

0.00 0.10 0.20 0.30 0.40 0.50 0.60 0.70 0.80 0.90 1.00

Pb Concentration (ug/m3)

Cu Concentration (ug/m3)

0

0.03

0.06

0.09

0.12

0.15

0.18

0.21

0.24

As Concentration (ug/m3)

Pb v. Cu Pb v. As Pb v. Cu Regression Pb v. As Regression

Proper Quality Assurance Was not Verified by ADEQ

All ambient air monitoring was conducted following the EPA approved Quality Assurance Project Plan 

(QAPP) written by CH2M Hill in November 2005. The QAPP, “Final Quality Assurance Project Plan, 

Asarco LLC Hayden Plant Site, Remedial Investigation, Gila County, AZ”, was amended in March 2009 

when Innovative Technical Solutions, Inc. (ITSI) was assigned the project by EPA Region 9. ITSI also 

amended the Field Sampling Plan (FSP) written by CH2M Hill in November 2005. Since John 

Hillenbrand, the EPA Region 9 Superfund project officer, transmitted the data to Jack Garrity of 

ASARCO on a regular basis beginning in October 2007, ASARCO had ample opportunity to acquire the 

QAPP and all its revisions. 

ADEQ did review the QAPP prior to making the decision to use these data for determining the attainment 

status of the Hayden area. The QAPP follows EPA guidelines contained in EPA Guidance for Quality 

Assurance Project Plans (EPA, 2002) and EPA Requirements for Quality Assurance Project Plans (EPA, 

2001). Thus, the following section headings correlate with the subtitles found in the EPA guidelines 

(EPA, 2002). It contains the procedures to be followed for sample collection, analysis, and data 

management. All sample analysis was performed by the EPA Region 9 laboratory. All quality control 

checks on samplers followed EPA 40 CFR 58 requirements. Communication from the ITSI consultant 

indicates that all documentation (field checks, log books, and laboratory reports) were reviewed by either 

CH2M Hill (2006-Feb, 2009) or ITSI (Feb 2009 and continuing) during instrument operation and data 

validation, and will be posted on the consultant's FTP Website. 

Specific descriptions of the air quality monitoring equipment and the required quality control checks are 

presented in Section 6 of the FSP. Air quality sampling at the two field locations began in November 

2006. 

The QAPP and FSP were in compliance with all EPA requirements, and personal communications with 

EPA staff and its contractors provided assurance that the procedures in the QAPP were strictly followed. 
Response to Zephyr Report on Pb Nonattainment Page 5 

December 9, 2009 

Further, EPA assessed the quality these data relative to compliance with the QAPP, FSP and their 

regulations, and concluded that the data were suitable for entry into the national data base. 

At the request of the Governor’s Office, elected officials and ASARCO, AQD staff conducted a detailed 

review of the QA/QC records for each data point for the July through November 2008 time period. Their 

conclusions are as follows: 

1. A QAPP was submitted to EPA in November 2005, prior to the start of sampling in October 2006. 

This complies with the EPA requirement for air monitoring programs to have an approved QAPP 

prior to the start of sampling. 

2. Addendums to the QAPP documents were made by the new consultant (ITSI) in March 2009. 

3. Instrument checks were performed as described in the Field Sampling Plan. Copies of the checks 

are available from ITSI. 

4. Laboratory reports contained chain of custody information, transmittal information, and 

laboratory quality control data along with the analytical results. 

5. ADEQ's review of the above information concludes the lead data provided by Region 9 

Superfund has experienced at least 3 levels of validation (sampler field checks and verification of 

sample validity immediately after collection, laboratory analysis and quality control checks of 

laboratory procedures) and review by EPA Superfund staff. These procedures are comparable to 

the procedures followed by ADEQ Air Assessment staff. 

6. The preliminary report by CH2M Hill omitted several sample results that were included in the 

EPA spreadsheet. CH2M Hill footnotes do not indicate why those samples were omitted but do 

state that additional validation and QA/QC could change the results included in the report. 

ADEQ review of all the QA/QC documentation supports EPA’s determination that the samples 

and the data generated from those samples were valid. 

7. All violations of the 2008 Pb NAAQS calculated by ADEQ and included in the recommendation 

to designate the Hayden area as nonattainment are accurate and valid. 

3-month Means and Design Values

The ADEQ TSD Table 4-1 lists three exceedances of the NAAQS in 2008 at the Hayden Town 

Maintenance Building. These averages were in the CH2M Hill report prepared for EPA in December 

2008, “Preliminary Evaluation of PM10 and Metals Concentrations from October 2007 to December 

2008 in ambient Air at the Hayden and Winkelman Monitoring Stations.” The report includes an 

appendix of tables of all analytical results from the samples CH2M Hill considered valid. Samples are 

from the period November 13, 2007 through November 30, 2008. Footnote 28 of each table states, "This 

table should be considered preliminary and will be revised based on incoming data, final data validation 

and QA/QC." 

Three-month Means and Design Values were calculated using the larger quality assured data set provided 

by the EPA Superfund project manager, John Hillenbrand, who also transmitted the same spreadsheets to 

Jack Garrity of ASARCO. These data include validated samples from October 22, 2006, through 

December 30, 2008. These data were reported to the EPA Air Quality System (AQS) by the September 1, 

2009 deadline listed in the CFR. Since EPA owns the data, EPA Region 9 is listed as the Primary Quality 

Assurance Organization (PQAO), collecting agency, and analyzing agency. ADEQ is listed only as the 

reporting agency, which is a function that ADEQ performs in its regular course of business. 

Design Values were calculated for both the Winkelman and Hayden sites from the October 22, 2006, 

through December 30, 2008, data and included in the 'Tables' appendix of the TSD. These values were 

calculated following 40 CFR 50 Appendix R requirements. Several 3-month periods had less than 75% 

data capture requiring data substitution tests to be performed as described in Appendix R Section 4(ii). 

The result of the data substitution test is a 'test mean' and is not considered the actual 3-month parameters 

mean and is not used in the calculation of the design value. It confirms the likelihood that the original 

mean (with less than 75% data capture) reflects the true over/under NAAQS status. ADEQ’s calculations 
Response to Zephyr Report on Pb Nonattainment Page 6 

December 9, 2009 

and determinations regarding data capture and validity of averages are attached to this document, and will 

be included in the TSD. 

• ZEC included the full EPA data set for Hayden (lead only) in the appendix of the document, but 

discussed only the CH2M Hill document and results in their report. CH2M Hill's report gave EPA 

an early look at the preliminary results of the field sampling. The validated data set from EPA 

includes samples that CH2M Hill rejected. 

• ADEQ used the EPA dataset to perform the data capture and concentration calculations, thus 

resulting in some differences from the ZEC findings. However, ZEC does not show all 

calculations for the CH2M Hill data (i.e., all 3 month averages and data completeness statistics) 

and it is unclear whether or not they used the extra samples in their calculations. Even if the only 

3-month average retained is the July-Aug-Sept 2008 average (as they maintain), our calculations 

show it has a concentration of 0.17 ug/m3

, meaning the monitor is in violation. ADEQ’s method 

for calculating the averages for calendar year 2008 and using data substitution as outlined in 40 

CFR 50 Appendix R may be found in Appendix A of this document. 

The Design Value Was not Adequately Discussed

ADEQ agrees with the comment regarding this issue and will make corresponding changes to the TSD to 

include the full data set relied upon and a discussion of the design value and how it was derived. 
Response to Zephyr Report on Pb Nonattainment Page 7 

December 9, 2009 

Appendix A 

3-Month Average Lead Concentration Calculations 

For the Hayden Maintenance Yard Monitor for Calendar Year 2008 

2008 Monthy/3-Month Summary – Pb-PM10 Standard Conditions 

Invalid 3-month average due to data capture 

Invalid 3-month average due to data capture and insufficient number of samples. 

Month 

No. of 

Possible 

Samples 

No. of 

Creditable 

Samples 

Monthly 

Data 

Capture 

(%) 

No. of 

Extra 

Samples 

Monthly 

Average 

Lead 

(μg/m3) 

3-Month 

Data 

Capture 

(%) 

3-Month 

Average 

Lead 

(μg/m3) 

January # 5 2 40 0 0.1045 58 0.11 

February ^ 5 3 60 0 0.0377 44 0.10 

March ^ 5 4 80 0 0.0400 60 0.06 

April ^ 5 4 80 2 0.1193 73 0.07 

May 5 5 100 2 0.0756 87 0.08 

June 5 3 60 4 0.0714 80 0.09 

July 5 5 100 3 0.0653 80 0.07 

August ^ 5 3 60 4 0.1560 73 0.10 

September 5 4 80 0 0.2880 80 0.17 

October ^^ 5 4 80 1 0.1162 73 0.19 

November ^^ 5 3 60 3 0.2325 73 0.21 

December # 5 4 80 1 0.0682 73 0.14 

 Valid 3-month average (may include data substitution). 

^ Data Capture <75% and average is below the NAAQS, so data substitution is not allowed. As a result, this is not a 

valid 3-month average. 

^^ Data Capture <75% and average is the above the NAAQS; 40 CFR 50 Appendix R § 4(c)(ii)(A) allows use of the 

LOWEST data value recorded in the same month over the design period as a substitute for the missing sample(s) up 

to minimum 75% data capture. This 3-month average is valid. 

# Data Capture <75% and number of samples for month in the design value period is insufficient; thus, data 

substitution not done and 3-month average is invalid. 

 

Above the NAAQS test - February 2008 

Month 

No. of 

Possible 

Samples 

No. of 

Creditable 

Samples 

Monthly 

Data 

Capture 

(%) 

No. of 

Extra 

Samples 

Monthly 

Average 

Lead 

(μg/m3) 

3-Month 

Data 

Capture 

(%) 

3-Month 

Average 

Lead 

(μg/m3) 

December ~ 6 6 100 0 0.0522 

January ~ 5 4 80 0 0.0543 

February 5 3 60 0 0.0377 80 0.05 

~ December had 4 samples substituted with 0.002 μg/m3 from 12/21/2006 and January had 2 samples substituted 

with 0.004 μg/m3 from 1/20/2007 for 2006-2008 Design Value period to get the February 2008 Data Capture >75%. 

 

Above the NAAQS test - March 2008 

Month 

No. of 

Possible 

Samples 

No. of 

Creditable 

Samples 

Monthly 

Data 

Capture 

(%) 

No. of 

Extra 

Samples 

Monthly 

Average 

Lead 

(μg/m3) 

3-Month 

Data 

Capture 

(%) 

3-Month 

Average 

Lead 

(μg/m3) 

January ~ 5 5 100 0 0.0442 

February 5 3 60 0 0.0377 

March 5 4 80 1 0.0400 80 0.04 

~ January had 3 samples substituted with 0.004 μg/m3 from 1/20/2007 for 2006-2008 Design Value period to get the 

March 2008 Data Capture >75%. 

Revisions from December 3, 2009 version: Table footnote “^^” was revised to properly characterize the data substitution 

procedure. Actual dates of substitute sample values were added. 
Response to Zephyr Report on Pb Nonattainment Page 8 

December 9, 2009 

Above the NAAQS test - April 2008 

Month 

No. of 

Possible 

Samples 

No. of 

Creditable 

Samples 

Monthly 

Data 

Capture 

(%) 

No. of 

Extra 

Samples 

Monthly 

Average 

Lead 

(μg/m3) 

3-Month 

Data 

Capture 

(%) 

3-Month 

Average 

Lead 

(μg/m3) 

February ~ 5 4 80 0 0.0295 

March 5 4 80 1 0.0400 

April 5 4 80 2 0.1193 80 0.06 

~ February had 1 sample substituted with 0.005 μg/m3 from 2/1/2007 for 2006-2008 Design Value period to get the 

April 2008 Data Capture >75%. 

Above the NAAQS test - August 2008 

Month 

No. of 

Possible 

Samples 

No. of 

Creditable 

Samples 

Monthly 

Data 

Capture 

(%) 

No. of 

Extra 

Samples 

Monthly 

Average 

Lead 

(μg/m3) 

3-Month 

Data 

Capture 

(%) 

3-Month 

Average 

Lead 

(μg/m3) 

June ~ 5 4 80 4 0.0630 

July 5 5 100 3 0.0653 

August 5 3 60 4 0.1560 80 0.09 

~ June had 1 sample substituted with 0.004 μg/m3 from 6/7/2007 for 2006-2008 Design Value period to get the 

August 2008 Data Capture >75%. 

Above the NAAQS test - October 2008 

Month 

No. of 

Possible 

Samples 

No. of 

Creditable 

Samples 

Monthly 

Data 

Capture 

(%) 

No. of 

Extra 

Samples 

Monthly 

Average 

Lead 

(μg/m3

) 

3-Month 

Data 

Capture 

(%) 

3-Month 

Average 

Lead 

(μg/m3) 

August ~ 5 4 80 4 0.1383 

September 5 4 80 0 0.2880 

October 5 4 80 1 0.1162 80 0.18 

~ August had 1 sample substituted with 0.014 μg/m3 from 8/6/2007 for 2006-2008 Design Value period to get the 

October 2008 Data Capture >75%. 

Above the NAAQS test - November 2008 

Month 

No. of 

Possible 

Samples 

No. of 

Creditable 

Samples 

Monthly 

Data 

Capture 

(%) 

No. of 

Extra 

Samples 

Monthly 

Average 

Lead 

(μg/m3) 

3-Month 

Data 

Capture 

(%) 

3-Month 

Average 

Lead 

(μg/m3) 

September 5 4 80 0 0.2880 

October 5 4 80 1 0.1162 

November ~ 5 4 80 3 0.1999 80 0.20 

~ November had 1 sample substituted with 0.004 μg/m3 from 11/13/2007 for 2006-2008 Design Value period to get 

the November 2008 Data Capture >75%. 

Revisions from the December 3, 2009 version: Actual dates of substitute sample values were added.
 8

Appendix H 

Town of Kearny Resolution Regarding Pb Boundary Recommendation 
 9

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